diff --git a/CHANGES b/CHANGES
index 6014cd2..6cb1d7c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,9 @@
 
 new features:
+	new address types SCTP-CONNECT and SCTP-LISTEN implement SCTP stream
+	mode for IPv4 and IPv6; new address options sctp-maxseg and
+	sctp-nodelay
+
 	added generic socket addresses: SOCKET-CONNECT, SOCKET-LISTEN,
 	SOCKET-SENDTO, SOCKET-RECVFROM, SOCKET-RECV, SOCKET-DATAGRAM allow
 	protocol independent socket handling; all parameters are explicitely
diff --git a/Makefile.in b/Makefile.in
index e5b1f29..7e505a4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -46,7 +46,7 @@ XIOSRCS = xioinitialize.c xiohelp.c xioparam.c xiodiag.c xioopen.c xioopts.c \
 	xio-process.c xio-fd.c xio-fdnum.c xio-stdio.c xio-pipe.c \
 	xio-gopen.c xio-creat.c xio-file.c xio-named.c \
 	xio-socket.c xio-listen.c xio-unix.c xio-ip.c xio-ip4.c xio-ip6.c xio-ipapp.c xio-tcp.c xio-socks.c xio-proxy.c xio-udp.c \
-	xio-rawip.c \
+	xio-sctp.c xio-rawip.c \
 	xio-progcall.c xio-exec.c xio-system.c xio-termios.c xio-readline.c \
 	xio-pty.c xio-openssl.c \
 	xio-ascii.c xiolockfile.c xio-tcpwrap.c xio-ext2.c xio-tun.c
@@ -63,6 +63,7 @@ HFILES = sycls.h sslcls.h error.h dalan.h procan.h filan.h hostan.h sysincludes.
 	xio-named.h xio-file.h xio-creat.h xio-gopen.h xio-pipe.h xio-socket.h \
 	xio-listen.h xio-unix.h xio-rawip.h xio-ip.h xio-ip4.h xio-ip6.h \
 	xio-ipapp.h xio-tcp.h xio-udp.h xio-socks.h xio-proxy.h xio-progcall.h xio-exec.h \
+	xio-sctp.h \
 	xio-system.h xio-termios.h xio-readline.h \
 	xio-pty.h xio-openssl.h \
 	xio-ascii.h xiolockfile.h xio-tcpwrap.h xio-ext2.h xio-tun.h
diff --git a/VERSION b/VERSION
index 0573f31..64a05c6 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics+poll+udplistencont+ignoreeofunblock+escape+timestamp+ancillary+envvar+protocol+ioctl+setsockopt+genericsocket"
+"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics+poll+udplistencont+ignoreeofunblock+escape+timestamp+ancillary+envvar+protocol+ioctl+setsockopt+genericsocket+sctp"
diff --git a/config.h.in b/config.h.in
index ec9236a..7f7dcbc 100644
--- a/config.h.in
+++ b/config.h.in
@@ -1,5 +1,5 @@
 /* source: config.h.in */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __config_h_included
@@ -471,6 +471,7 @@
 #undef WITH_GENERICSOCKET
 #undef WITH_TCP
 #undef WITH_UDP
+#undef WITH_SCTP
 #undef WITH_LISTEN
 #undef WITH_SOCKS4
 #undef WITH_SOCKS4A
diff --git a/configure.in b/configure.in
index 8bb4e10..26074c6 100644
--- a/configure.in
+++ b/configure.in
@@ -237,6 +237,14 @@ AC_ARG_ENABLE(udp, [  --disable-udp           disable UDP support],
 	       esac],
 	       [AC_DEFINE(WITH_UDP) AC_MSG_RESULT(yes)])
 
+AC_MSG_CHECKING(whether to include SCTP support)
+AC_ARG_ENABLE(tcp, [  --disable-sctp           disable SCTP support],
+	      [case "$enableval" in
+	       no) AC_MSG_RESULT(no);;
+	       *) AC_DEFINE(WITH_SCTP) AC_MSG_RESULT(yes);;
+	       esac],
+	       [AC_DEFINE(WITH_SCTP) AC_MSG_RESULT(yes)])
+
 AC_MSG_CHECKING(whether to include listen support)
 AC_ARG_ENABLE(listen, [  --disable-listen        disable listen support],
 	      [case "$enableval" in
diff --git a/doc/socat.yo b/doc/socat.yo
index 2644c4d..5723b1e 100644
--- a/doc/socat.yo
+++ b/doc/socat.yo
@@ -600,6 +600,69 @@ label(ADDRESS_READLINE)dit(bf(tt(READLINE)))
    link(noecho)(OPTION_NOECHO)nl()
    See also:
    link(STDIO)(ADDRESS_STDIO)
+label(ADDRESS_SCTP_CONNECT)dit(bf(tt(SCTP-CONNECT:<host>:<port>)))
+   Establishes an SCTP stream connection to the specified <host> [link(IP
+   address)(TYPE_IP_ADDRESS)] and <port> [link(TCP service)(TYPE_TCP_SERVICE)]
+   using TCP/IP version 4 or 6 depending on address specification, name
+   resolution, or option link(pf)(OPTION_PROTOCOL_FAMILY).nl()
+   Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(IP4)(GROUP_IP4),link(IP6)(GROUP_IP6),link(SCTP)(GROUP_SCTP),link(CHILD)(GROUP_CHILD),link(RETRY)(GROUP_RETRY) nl()
+   Useful options:
+   link(bind)(OPTION_BIND),
+   link(pf)(OPTION_PROTOCOL_FAMILY),
+   link(connect-timeout)(OPTION_CONNECT_TIMEOUT),
+   link(tos)(OPTION_TOS),
+   link(mtudiscover)(OPTION_MTUDISCOVER),
+   link(mss)(OPTION_MSS),
+   link(nodelay)(OPTION_NODELAY),
+   link(nonblock)(OPTION_NONBLOCK),
+   link(sourceport)(OPTION_SOURCEPORT),
+   link(retry)(OPTION_RETRY),
+   link(readbytes)(OPTION_READBYTES)nl()
+   See also:
+   link(SCTP4-CONNECT)(ADDRESS_SCTP4_CONNECT),
+   link(SCTP6-CONNECT)(ADDRESS_SCTP6_CONNECT),
+   link(SCTP-LISTEN)(ADDRESS_SCTP_LISTEN),
+   link(TCP-CONNECT)(ADDRESS_TCP_CONNECT)
+label(ADDRESS_SCTP4_CONNECT)dit(bf(tt(SCTP4-CONNECT:<host>:<port>)))
+   Like link(SCTP-CONNECT)(ADDRESS_SCTP_CONNECT), but only supports IPv4 protocol.nl()
+   Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(IP4)(GROUP_IP4),link(SCTP)(GROUP_SCTP),link(CHILD)(GROUP_CHILD),link(RETRY)(GROUP_RETRY) nl()
+label(ADDRESS_SCTP6_CONNECT)dit(bf(tt(SCTP6-CONNECT:<host>:<port>)))
+   Like link(SCTP-CONNECT)(ADDRESS_SCTP_CONNECT), but only supports IPv6 protocol.nl()
+   Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(IP6)(GROUP_IP6),link(SCTP)(GROUP_SCTP),link(CHILD)(GROUP_CHILD),link(RETRY)(GROUP_RETRY) nl()
+label(ADDRESS_SCTP_LISTEN)dit(bf(tt(SCTP-LISTEN:<port>)))
+   Listens on <port> [link(TCP service)(TYPE_TCP_SERVICE)] and accepts a
+   TCP/IP connection. The IP version is 4 or the one specified with
+   address option link(pf)(OPTION_PROTOCOL_FAMILY), socat option
+   (link(-4)(option_4), link(-6)(option_6)), or environment variable link(SOCAT_DEFAULT_LISTEN_IP)(ENV_SOCAT_DEFAULT_LISTEN_IP).
+   Note that opening
+   this address usually blocks until a client connects.nl()
+   Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(LISTEN)(GROUP_LISTEN),link(CHILD)(GROUP_CHILD),link(RANGE)(GROUP_RANGE),link(IP4)(GROUP_IP4),link(IP6)(GROUP_IP6),link(SCTP)(GROUP_SCTP),link(RETRY)(GROUP_RETRY) nl()
+   Useful options:
+   link(crnl)(OPTION_CRNL),
+   link(fork)(OPTION_FORK),
+   link(bind)(OPTION_BIND),
+   link(range)(OPTION_RANGE),
+   link(tcpwrap)(OPTION_TCPWRAPPERS),
+   link(pf)(OPTION_PROTOCOL_FAMILY),
+   link(backlog)(OPTION_BACKLOG),
+   link(mss)(OPTION_MSS),
+   link(su)(OPTION_SUBSTUSER),
+   link(reuseaddr)(OPTION_REUSEADDR),
+   link(retry)(OPTION_RETRY),
+   link(cool-write)(OPTION_COOL_WRITE)nl()
+   See also:
+   link(SCTP4-LISTEN)(ADDRESS_SCTP4_LISTEN),
+   link(SCTP6-LISTEN)(ADDRESS_SCTP6_LISTEN),
+   link(TCP-LISTEN)(ADDRESS_TCP_LISTEN),
+   link(SCTP-CONNECT)(ADDRESS_SCTP_CONNECT)
+label(ADDRESS_SCTP4_LISTEN)dit(bf(tt(SCTP4-LISTEN:<port>)))
+   Like link(SCTP-LISTEN)(ADDRESS_SCTP_LISTEN), but only supports IPv4
+   protocol.nl() 
+   Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(LISTEN)(GROUP_LISTEN),link(CHILD)(GROUP_CHILD),link(RANGE)(GROUP_RANGE),link(IP4)(GROUP_IP4),link(SCTP)(GROUP_SCTP),link(RETRY)(GROUP_RETRY) nl()
+label(ADDRESS_SCTP6_LISTEN)dit(bf(tt(SCTP6-LISTEN:<port>)))
+   Like link(SCTP-LISTEN)(ADDRESS_SCTP_LISTEN), but only supports IPv6
+   protocol.nl() 
+   Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(LISTEN)(GROUP_LISTEN),link(CHILD)(GROUP_CHILD),link(RANGE)(GROUP_RANGE),link(IP6)(GROUP_IP6),link(SCTP)(GROUP_SCTP),link(RETRY)(GROUP_RETRY) nl()
 label(ADDRESS_SOCKET_CONNECT)dit(bf(tt(SOCKET-CONNECT:<domain>:<protocol>:<remote-address>)))
    Creates a stream socket using the first and second given socket parameters
    and tt(SOCK_STREAM) (see man socket(2)) and connects to the remote-address.
@@ -829,6 +892,7 @@ label(ADDRESS_TCP_CONNECT)dit(bf(tt(TCP:<host>:<port>)))
    link(TCP6)(ADDRESS_TCP6_CONNECT),
    link(TCP-LISTEN)(ADDRESS_TCP_LISTEN),
    link(UDP)(ADDRESS_UDP_CONNECT),
+   link(SCTP-CONNECT)(ADDRESS_SCTP_CONNECT),
    link(UNIX-CONNECT)(ADDRESS_UNIX_CONNECT)
 label(ADDRESS_TCP4_CONNECT)dit(bf(tt(TCP4:<host>:<port>)))
    Like link(TCP)(ADDRESS_TCP_CONNECT), but only supports IPv4 protocol (link(example)(EXAMPLE_ADDRESS_TCP4_CONNECT)).nl()
@@ -839,7 +903,8 @@ label(ADDRESS_TCP6_CONNECT)dit(bf(tt(TCP6:<host>:<port>)))
 label(ADDRESS_TCP_LISTEN)dit(bf(tt(TCP-LISTEN:<port>)))
    Listens on <port> [link(TCP service)(TYPE_TCP_SERVICE)] and accepts a
    TCP/IP connection. The IP version is 4 or the one specified with
-   link(pf)(OPTION_PROTOCOL_FAMILY).
+   address option link(pf)(OPTION_PROTOCOL_FAMILY), socat option
+   (link(-4)(option_4), link(-6)(option_6)), or environment variable link(SOCAT_DEFAULT_LISTEN_IP)(ENV_SOCAT_DEFAULT_LISTEN_IP).
    Note that opening
    this address usually blocks until a client connects.nl()
    Option groups: link(FD)(GROUP_FD),link(SOCKET)(GROUP_SOCKET),link(LISTEN)(GROUP_LISTEN),link(CHILD)(GROUP_CHILD),link(RANGE)(GROUP_RANGE),link(IP4)(GROUP_IP4),link(IP6)(GROUP_IP6),link(TCP)(GROUP_TCP),link(RETRY)(GROUP_RETRY) nl()
@@ -855,13 +920,15 @@ label(ADDRESS_TCP_LISTEN)dit(bf(tt(TCP-LISTEN:<port>)))
    link(su)(OPTION_SUBSTUSER),
    link(reuseaddr)(OPTION_REUSEADDR),
    link(retry)(OPTION_RETRY),
-   link(retry)(OPTION_COOL_WRITE)nl()
+   link(cool-write)(OPTION_COOL_WRITE)nl()
    See also:
-   link(TCP4-LISTEN)(ADDRESS_TCP4_CONNECT),
+   link(TCP4-LISTEN)(ADDRESS_TCP4_LISTEN),
    link(TCP6-LISTEN)(ADDRESS_TCP6_LISTEN),
    link(UDP-LISTEN)(ADDRESS_UDP_LISTEN),
+   link(SCTP-LISTEN)(ADDRESS_SCTP_LISTEN),
    link(UNIX-LISTEN)(ADDRESS_UNIX_LISTEN),
-   link(OPENSSL-LISTEN)(ADDRESS_OPENSSL_LISTEN)
+   link(OPENSSL-LISTEN)(ADDRESS_OPENSSL_LISTEN),
+   link(TCP-CONNECT)(ADDRESS_TCP_CONNECT)
 label(ADDRESS_TCP4_LISTEN)dit(bf(tt(TCP4-LISTEN:<port>)))
    Like link(TCP-LISTEN)(ADDRESS_TCP_LISTEN), but only supports IPv4
    protocol (link(example)(EXAMPLE_ADDRESS_TCP4_LISTEN)).nl() 
@@ -2058,10 +2125,24 @@ enddit()
 startdit()enddit()nl()
 
 
-em(bf(UDP and TCP option groups))
+label(GROUP_SCTP)em(bf(SCTP option group))
+
+These options may be applied to SCTP stream sockets.
+startdit()
+label(OPTION_SCTP_NODELAY)dit(bf(tt(sctp-nodelay)))
+   Sets the SCTP_NODELAY socket option that disables the Nagle algorithm.
+label(OPTION_SCTP_MAXSEG)dit(bf(tt(sctp-maxseg=<bytes>)))
+   Sets the SCTP_MAXSEG socket option to <bytes> [link(int)(TYPE_INT)].  This
+   value is then proposed to the peer with the SYN or SYN/ACK packet. 
+enddit()
+
+startdit()enddit()nl()
+
+
+em(bf(UDP, TCP, and SCTP option groups))
 
 Here we find options that are related to the network port mechanism and that
-thus can be used with UDP and TCP, client and server addresses.
+thus can be used with UDP, TCP, and SCTP client and server addresses.
 startdit()
 label(OPTION_SOURCEPORT)dit(bf(tt(sourceport=<port>)))
    For outgoing (client) TCP and UDP connections, it sets the source
@@ -3163,11 +3244,11 @@ by the upper case name of the executable or the value of option
 link(-lp)(option_lp).
 
 startdit()
+label(ENV_SOCAT_DEFAULT_LISTEN_IP)
 dit(bf(SOCAT_DEFAULT_LISTEN_IP) (input)) (Values 4 or 6) Sets the IP version to
-be used 
-for listen, recv, and recvfrom addresses if no link(pf)(OPTION_PROTOCOL_FAMILY)
-(protocol-family) option is given. Is overridden by socat options
-link(-4)(option_4) or link(-6)(option_6).
+be used for listen, recv, and recvfrom addresses if no
+link(pf)(OPTION_PROTOCOL_FAMILY) (protocol-family) option is given. Is
+overridden by socat options link(-4)(option_4) or link(-6)(option_6).
 
 dit(bf(SOCAT_PREFERRED_RESOLVE_IP) (input)) (Values 0, 4, or 6) Sets the IP
 version to 
diff --git a/socat.c b/socat.c
index 28698bf..cf56a83 100644
--- a/socat.c
+++ b/socat.c
@@ -438,6 +438,11 @@ void socat_version(FILE *fd) {
 #else
    fputs("  #undef WITH_UDP\n", fd);
 #endif
+#ifdef WITH_SCTP
+   fprintf(fd, "  #define WITH_SCTP %d\n", WITH_SCTP);
+#else
+   fputs("  #undef WITH_SCTP\n", fd);
+#endif
 #ifdef WITH_LISTEN
    fprintf(fd, "  #define WITH_LISTEN %d\n", WITH_LISTEN);
 #else
diff --git a/sysutils.c b/sysutils.c
index 472d946..615fb55 100644
--- a/sysutils.c
+++ b/sysutils.c
@@ -423,7 +423,9 @@ int xiopoll(struct pollfd fds[], nfds_t nfds, int timeout) {
    
 
 #if WITH_TCP || WITH_UDP
-/* returns port in network byte order */
+/* returns port in network byte order;
+   ipproto==IPPROTO_UDP resolves as UDP service, every other value resolves as
+   TCP */
 int parseport(const char *portname, int ipproto) {
    struct servent *se;
    char *extra;
@@ -438,7 +440,7 @@ int parseport(const char *portname, int ipproto) {
       return result;
    }
 
-   if ((se = getservbyname(portname, ipproto==IPPROTO_TCP?"tcp":"udp")) == NULL) {
+   if ((se = getservbyname(portname, ipproto==IPPROTO_UDP?"udp":"tcp")) == NULL) {
       Error2("cannot resolve service \"%s/%d\"", portname, ipproto);
       return 0;
    }
diff --git a/test.sh b/test.sh
index b847500..f5ebbf1 100755
--- a/test.sh
+++ b/test.sh
@@ -1866,6 +1866,40 @@ waitudp4port () {
     return 1
 }
 
+# wait until an SCTP4 listen port is ready
+waitsctp4port () {
+    local port="$1"
+    local logic="$2"	# 0..wait until free; 1..wait until listening
+    local timeout="$3"
+    local l
+    [ "$logic" ] || logic=1
+    [ "$timeout" ] || timeout=5
+    while [ $timeout -gt 0 ]; do
+	case "$UNAME" in
+	Linux)   l=$(netstat -n -a |grep '^sctp .* .*[0-9*]:'$port' .* LISTEN') ;;
+#	FreeBSD) l=$(netstat -an |grep '^tcp4.* .*[0-9*]\.'$port' .* \*\.\* .* LISTEN') ;;
+#	NetBSD)  l=$(netstat -an |grep '^tcp .* .*[0-9*]\.'$port' [ ]* \*\.\* [ ]* LISTEN.*') ;;
+#	Darwin) case "$(uname -r)" in
+#		[1-5]*) l=$(netstat -an |grep '^tcp.* .*[0-9*]\.'$port' .* \*\.\* .* LISTEN') ;;
+#		*) l=$(netstat -an |grep '^tcp4.* .*[0-9*]\.'$port' .* \*\.\* .* LISTEN') ;;
+#		esac ;;
+#	AIX)	 l=$(netstat -an |grep '^tcp[^6]       0      0 .*[*0-9]\.'$port' .* LISTEN$') ;;
+#	SunOS)   l=$(netstat -an -f inet -P tcp |grep '.*[1-9*]\.'$port' .*\*                0 .* LISTEN') ;;
+#	HP-UX)   l=$(netstat -an |grep '^tcp        0      0  .*[0-9*]\.'$port' .* LISTEN$') ;;
+#	OSF1)    l=$(/usr/sbin/netstat -an |grep '^tcp        0      0  .*[0-9*]\.'$port' [ ]*\*\.\* [ ]*LISTEN') ;;
+#	CYGWIN*) l=$(netstat -an -p TCP |grep '^  TCP    [0-9.]*:'$port' .* LISTENING') ;;
+ 	*)       l=$(netstat -an |grep -i 'sctp .*[0-9*][:.]'$port' .* listen') ;;
+	esac
+	[ \( \( $logic -ne 0 \) -a -n "$l" \) -o \
+	  \( \( $logic -eq 0 \) -a -z "$l" \) ] && return 0
+	sleep 1
+	timeout=$((timeout-1))
+    done
+
+    $ECHO "!port $port timed out! \c" >&2
+    return 1
+}
+
 # wait until a tcp6 listen port is ready
 waittcp6port () {
     local port="$1"
@@ -1926,6 +1960,36 @@ waitudp6port () {
     return 1
 }
 
+# wait until a sctp6 listen port is ready
+# not all (Linux) variants show this in netstat
+waitsctp6port () {
+    local port="$1"
+    local logic="$2"	# 0..wait until free; 1..wait until listening
+    local timeout="$3"
+    local l
+    [ "$logic" ] || logic=1
+    [ "$timeout" ] || timeout=5
+    while [ $timeout -gt 0 ]; do
+	case "$UNAME" in
+	Linux)   l=$(netstat -an |grep '^sctp[6 ] .* [0-9a-f:]*:'$port' .* LISTEN') ;;
+#	FreeBSD) l=$(netstat -an |grep -i 'tcp[46][6 ] .*[0-9*][:.]'$port' .* listen') ;;
+#	NetBSD)  l=$(netstat -an |grep '^tcp6 .*[0-9*]\.'$port' [ ]* \*\.\*') ;;
+#	OpenBSD) l=$(netstat -an |grep -i 'tcp6 .*[0-9*][:.]'$port' .* listen') ;;
+#	AIX)	 l=$(netstat -an |grep '^tcp[6 ]       0      0 .*[*0-9]\.'$port' .* LISTEN$') ;;
+#	SunOS)   l=$(netstat -an -f inet6 -P tcp |grep '.*[1-9*]\.'$port' .*\* [ ]* 0 .* LISTEN') ;;
+#	#OSF1)    l=$(/usr/sbin/netstat -an |grep '^tcp6       0      0  .*[0-9*]\.'$port' [ ]*\*\.\* [ ]*LISTEN') /*?*/;;
+ 	*)       l=$(netstat -an |grep -i 'stcp6 .*:'$port' .* listen') ;;
+	esac
+	[ \( \( $logic -ne 0 \) -a -n "$l" \) -o \
+	  \( \( $logic -eq 0 \) -a -z "$l" \) ] && return 0
+	sleep 1
+	timeout=$((timeout-1))
+    done
+
+    $ECHO "!port $port timed out! \c" >&2
+    return 1
+}
+
 # we need this misleading function name for canonical reasons
 waitunixport () {
     waitfile "$1" "$2" "$3"
@@ -9174,6 +9238,7 @@ esac
 PORT=$((PORT+1))
 N=$((N+1))
 
+
 # test the SOCKET-RECV address (with UDP4-SENDTO)
 NAME=SOCKET_RECV
 case "$TESTS" in
@@ -9427,6 +9492,103 @@ PORT=$((PORT+1))
 N=$((N+1))
 
 
+NAME=SCTP4STREAM
+case "$TESTS" in
+*%functions%*|*%ip4%*|*%ipapp%*|*%sctp%*|*%$NAME%*)
+TEST="$NAME: echo via connection to SCTP V4 socket"
+if ! testaddrs sctp ip4 >/dev/null || ! runsip4 >/dev/null; then
+    $PRINTF "test $F_n $TEST... ${YELLOW}SCTP4 not available${NORMAL}\n" $N
+    numCANT=$((numCANT+1))
+elif [ "$UNAME" = Linux ] && ! grep ^sctp /proc/modules >/dev/null; then
+    # RHEL5 based systems became unusable when an sctp socket was created but
+    # module sctp not loaded
+    $PRINTF "test $F_n $TEST...${YELLOW}load sctp module!${NORMAL}\n" $N
+    numCANT=$((numCANT+1))
+else
+tf="$td/test$N.stdout"
+te="$td/test$N.stderr"
+tdiff="$td/test$N.diff"
+tsl=$PORT
+ts="127.0.0.1:$tsl"
+da=$(date)
+CMD1="$SOCAT $opts SCTP4-LISTEN:$tsl,reuseaddr PIPE"
+CMD2="$SOCAT $opts stdin!!stdout SCTP4:$ts"
+printf "test $F_n $TEST... " $N
+$CMD1 >"$tf" 2>"${te}1" &
+pid1=$!
+waitsctp4port $tsl 1
+# SCTP does not seem to support half close, so we let it 1s to finish
+(echo "$da"; sleep 1) |$CMD2 >>"$tf" 2>>"${te}2"
+if [ $? -ne 0 ]; then
+   $PRINTF "$FAILED: $SOCAT:\n"
+   echo "$CMD1 &"
+   cat "${te}1"
+   echo "$CMD2"
+   cat "${te}2"
+   numFAIL=$((numFAIL+1))
+elif ! echo "$da" |diff - "$tf" >"$tdiff"; then
+   $PRINTF "$FAILED\n"
+   cat "$tdiff"
+   numFAIL=$((numFAIL+1))
+else
+   $PRINTF "$OK\n"
+   if [ -n "$debug" ]; then cat "${te}1" "${te}2"; fi
+   numOK=$((numOK+1))
+fi
+kill $pid1 2>/dev/null
+wait
+fi ;;	# sctp
+esac
+PORT=$((PORT+1))
+N=$((N+1))
+
+NAME=SCTP6STREAM
+case "$TESTS" in
+*%functions%*|*%ip6%*|*%ipapp%*|*%sctp%*|*%$NAME%*)
+TEST="$NAME: echo via connection to SCTP V6 socket"
+if ! testaddrs sctp ip6 >/dev/null || ! runsip6 >/dev/null; then
+    $PRINTF "test $F_n $TEST... ${YELLOW}SCTP6 not available${NORMAL}\n" $N
+    numCANT=$((numCANT+1))
+elif [ "$UNAME" = Linux ] && ! grep ^sctp /proc/modules >/dev/null; then
+    $PRINTF "test $F_n $TEST...${YELLOW}load sctp module!${NORMAL}\n" $N
+    numCANT=$((numCANT+1))
+else
+tf="$td/test$N.stdout"
+te="$td/test$N.stderr"
+tdiff="$td/test$N.diff"
+tsl=$PORT
+ts="[::1]:$tsl"
+da=$(date)
+CMD1="$SOCAT $opts SCTP6-listen:$tsl,reuseaddr PIPE"
+CMD2="$SOCAT $opts stdin!!stdout SCTP6:$ts"
+printf "test $F_n $TEST... " $N
+$CMD1 >"$tf" 2>"${te}1" &
+pid=$!	# background process id
+waitsctp6port $tsl 1
+# SCTP does not seem to support half close, so we let it 1s to finish
+(echo "$da"; sleep 1) |$CMD2 >>"$tf" 2>>"${te}2"
+if [ $? -ne 0 ]; then
+   $PRINTF "$FAILED: $SOCAT:\n"
+   echo "$CMD1 &"
+   echo "$CMD2"
+   cat "$te"
+   numFAIL=$((numFAIL+1))
+elif ! echo "$da" |diff - "$tf" >"$tdiff"; then
+   $PRINTF "$FAILED: diff:\n"
+   cat "$tdiff"
+   numFAIL=$((numFAIL+1))
+else
+   $PRINTF "$OK\n"
+   if [ -n "$debug" ]; then cat "${te}1" "${te}2"; fi
+   numOK=$((numOK+1))
+fi
+kill $pid 2>/dev/null
+fi ;;	# sctp
+esac
+PORT=$((PORT+1))
+N=$((N+1))
+
+
 echo "summary: $((N-1)) tests; $numOK ok, $numFAIL failed, $numCANT could not be performed"
 
 if [ "$numFAIL" -gt 0 ]; then
diff --git a/xio-sctp.c b/xio-sctp.c
new file mode 100644
index 0000000..bcfec7e
--- /dev/null
+++ b/xio-sctp.c
@@ -0,0 +1,50 @@
+/* source: xio-sctp.c */
+/* Copyright Gerhard Rieger 2008 */
+/* Published under the GNU General Public License V.2, see file COPYING */
+
+/* this file contains the source for SCTP related functions and options */
+
+#include "xiosysincludes.h"
+
+#if WITH_SCTP
+
+#include "xioopen.h"
+#include "xio-listen.h"
+#include "xio-ip4.h"
+#include "xio-ipapp.h"
+#include "xio-sctp.h"
+
+/****** SCTP addresses ******/
+
+#if WITH_IP4 || WITH_IP6
+const struct addrdesc addr_sctp_connect = { "sctp-connect", 1+XIO_RDWR, xioopen_ipapp_connect, GROUP_FD|GROUP_SOCKET|GROUP_SOCK_IP4|GROUP_SOCK_IP6|GROUP_IP_SCTP|GROUP_CHILD|GROUP_RETRY, SOCK_STREAM, IPPROTO_SCTP, PF_UNSPEC HELP(":<host>:<port>") };
+#if WITH_LISTEN
+const struct addrdesc addr_sctp_listen  = { "sctp-listen",  1+XIO_RDWR, xioopen_ipapp_listen,  GROUP_FD|GROUP_SOCKET|GROUP_SOCK_IP4|GROUP_SOCK_IP6|GROUP_IP_SCTP|GROUP_LISTEN|GROUP_CHILD|GROUP_RANGE|GROUP_RETRY, SOCK_STREAM, IPPROTO_SCTP, PF_UNSPEC HELP(":<port>") };
+#endif
+#endif
+
+#if WITH_IP4
+const struct addrdesc addr_sctp4_connect = { "sctp4-connect", 1+XIO_RDWR, xioopen_ipapp_connect, GROUP_FD|GROUP_SOCKET|GROUP_SOCK_IP4|GROUP_IP_SCTP|GROUP_CHILD|GROUP_RETRY, SOCK_STREAM, IPPROTO_SCTP, PF_INET HELP(":<host>:<port>") };
+#if WITH_LISTEN
+const struct addrdesc addr_sctp4_listen  = { "sctp4-listen", 1+XIO_RDWR, xioopen_ipapp_listen, GROUP_FD|GROUP_SOCKET|GROUP_SOCK_IP4|GROUP_IP_SCTP|GROUP_LISTEN|GROUP_CHILD|GROUP_RANGE|GROUP_RETRY, SOCK_STREAM, IPPROTO_SCTP, PF_INET HELP(":<port>") };
+#endif
+#endif /* WITH_IP4 */
+
+#if WITH_IP6
+const struct addrdesc addr_sctp6_connect = { "sctp6-connect", 1+XIO_RDWR, xioopen_ipapp_connect, GROUP_FD|GROUP_SOCKET|GROUP_SOCK_IP6|GROUP_IP_SCTP|GROUP_CHILD|GROUP_RETRY, SOCK_STREAM, IPPROTO_SCTP, PF_INET6 HELP(":<host>:<port>") };
+#if WITH_LISTEN
+const struct addrdesc addr_sctp6_listen  = { "sctp6-listen", 1+XIO_RDWR, xioopen_ipapp_listen, GROUP_FD|GROUP_SOCKET|GROUP_SOCK_IP6|GROUP_IP_SCTP|GROUP_LISTEN|GROUP_CHILD|GROUP_RANGE|GROUP_RETRY, SOCK_STREAM, IPPROTO_SCTP, PF_INET6 HELP(":<port>") };
+#endif
+#endif /* WITH_IP6 */
+
+/****** SCTP address options ******/
+
+#ifdef SCTP_NODELAY
+const struct optdesc opt_sctp_nodelay = { "sctp-nodelay",   "nodelay", OPT_SCTP_NODELAY, GROUP_IP_SCTP, PH_PASTSOCKET, TYPE_INT,	OFUNC_SOCKOPT, SOL_SCTP, SCTP_NODELAY };
+#endif
+#ifdef SCTP_MAXSEG
+const struct optdesc opt_sctp_maxseg  = { "sctp-maxseg",    "mss",  OPT_SCTP_MAXSEG,  GROUP_IP_SCTP, PH_PASTSOCKET,TYPE_INT, OFUNC_SOCKOPT, SOL_SCTP, SCTP_MAXSEG };
+const struct optdesc opt_sctp_maxseg_late={"sctp-maxseg-late","mss-late",OPT_SCTP_MAXSEG_LATE,GROUP_IP_SCTP,PH_CONNECTED,TYPE_INT,OFUNC_SOCKOPT, SOL_SCTP, SCTP_MAXSEG};
+#endif
+
+#endif /* WITH_SCTP */
diff --git a/xio-sctp.h b/xio-sctp.h
new file mode 100644
index 0000000..de2adb3
--- /dev/null
+++ b/xio-sctp.h
@@ -0,0 +1,19 @@
+/* source: xio-sctp.h */
+/* Copyright Gerhard Rieger 2008 */
+/* Published under the GNU General Public License V.2, see file COPYING */
+
+#ifndef __xio_sctp_h_included
+#define __xio_sctp_h_included 1
+
+extern const struct addrdesc addr_sctp_connect;
+extern const struct addrdesc addr_sctp_listen;
+extern const struct addrdesc addr_sctp4_connect;
+extern const struct addrdesc addr_sctp4_listen;
+extern const struct addrdesc addr_sctp6_connect;
+extern const struct addrdesc addr_sctp6_listen;
+
+extern const struct optdesc opt_sctp_nodelay;
+extern const struct optdesc opt_sctp_maxseg;
+extern const struct optdesc opt_sctp_maxseg_late;
+
+#endif /* !defined(__xio_sctp_h_included) */
diff --git a/xiohelp.c b/xiohelp.c
index b37115b..fe232cd 100644
--- a/xiohelp.c
+++ b/xiohelp.c
@@ -43,7 +43,7 @@ static const char *addressgroupnames[] = {
 	"TERMIOS",	"RANGE",	"PTY",		"PARENT",
 	"UNIX",		"IP4",		"IP6",		"INTERFACE",
 	"UDP",		"TCP",		"SOCKS4",	"OPENSSL",
-	"PROCESS",	"APPL",		"HTTP",		"undef"
+	"PROCESS",	"APPL",		"HTTP",		"SCTP"
 } ;
 
 
diff --git a/xiomodes.h b/xiomodes.h
index 90a6745..48f8dac 100644
--- a/xiomodes.h
+++ b/xiomodes.h
@@ -28,6 +28,7 @@
 #include "xio-ipapp.h"
 #include "xio-tcp.h"
 #include "xio-udp.h"
+#include "xio-sctp.h"
 #include "xio-socks.h"
 #include "xio-proxy.h"
 #endif /* _WITH_SOCKET */
diff --git a/xioopen.c b/xioopen.c
index de42455..051bbc7 100644
--- a/xioopen.c
+++ b/xioopen.c
@@ -135,6 +135,26 @@ const struct addrname addressnames[] = {
 #if WITH_READLINE
    { "readline",	&addr_readline },
 #endif
+#if (WITH_IP4 || WITH_IP6) && WITH_SCTP
+   { "sctp",		&addr_sctp_connect },
+   { "sctp-connect",	&addr_sctp_connect },
+#if WITH_LISTEN
+   { "sctp-l",		&addr_sctp_listen },
+   { "sctp-listen",	&addr_sctp_listen },
+#endif
+   { "sctp4",		&addr_sctp4_connect },
+   { "sctp4-connect",	&addr_sctp4_connect },
+#if WITH_LISTEN
+   { "sctp4-l",		&addr_sctp4_listen },
+   { "sctp4-listen",	&addr_sctp4_listen },
+#endif
+   { "sctp6",		&addr_sctp6_connect },
+   { "sctp6-connect",	&addr_sctp6_connect },
+#if WITH_LISTEN
+   { "sctp6-l",		&addr_sctp6_listen },
+   { "sctp6-listen",	&addr_sctp6_listen },
+#endif
+#endif /* (WITH_IP4 || WITH_IP6) && WITH_SCTP */
 #if WITH_GENERICSOCKET
    { "sendto",			&xioaddr_socket_sendto },
 #endif
diff --git a/xioopen.h b/xioopen.h
index ba8bc62..2002be4 100644
--- a/xioopen.h
+++ b/xioopen.h
@@ -1,5 +1,5 @@
 /* source: xioopen.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __xioopen_h_included
diff --git a/xioopts.c b/xioopts.c
index f66485f..550a292 100644
--- a/xioopts.c
+++ b/xioopts.c
@@ -82,6 +82,12 @@ bool xioopts_ignoregroups;
 #  define IF_TCP(a,b) 
 #endif
 
+#if WITH_SCTP
+#  define IF_SCTP(a,b) {a,b},
+#else
+#  define IF_SCTP(a,b) 
+#endif
+
 #if WITH_SOCKS4
 #  define IF_SOCKS4(a,b) {a,b},
 #else
@@ -1208,6 +1214,13 @@ const struct optname optionnames[] = {
 	IF_TCP    ("sackena",	&opt_tcp_sackena)
 #endif
 	IF_TERMIOS("sane",	&opt_sane)
+#ifdef SCTP_MAXSEG
+	IF_SCTP   ("sctp-maxseg",	&opt_sctp_maxseg)
+	IF_SCTP   ("sctp-maxseg-late",	&opt_sctp_maxseg_late)
+#endif
+#ifdef SCTP_NODELAY
+	IF_SCTP   ("sctp-nodelay",	&opt_sctp_nodelay)
+#endif
 #if WITH_EXT2 && defined(EXT2_SECRM_FL)
 	IF_ANY    ("secrm",	&opt_ext2_secrm)
 #endif
diff --git a/xioopts.h b/xioopts.h
index b5b846d..2a02362 100644
--- a/xioopts.h
+++ b/xioopts.h
@@ -166,6 +166,7 @@ enum e_func {
 #define GROUP_PROCESS	0x10000000	/* a process related option */
 #define GROUP_APPL	0x20000000	/* option handled by data loop */
 #define GROUP_HTTP	0x40000000	/* any HTTP client */
+#define GROUP_IP_SCTP	0x80000000
 
 #define GROUP_ANY	(GROUP_PROCESS|GROUP_APPL)
 #define GROUP_ALL	0xffffffff
@@ -568,6 +569,9 @@ enum e_optcode {
    OPT_RES_USEVC,	/* resolver(3) */
    OPT_RETRY,
    OPT_SANE,		/* termios */
+   OPT_SCTP_MAXSEG,
+   OPT_SCTP_MAXSEG_LATE,
+   OPT_SCTP_NODELAY,
    OPT_SEEK32_CUR,
    OPT_SEEK32_END,
    OPT_SEEK32_SET,