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Special Forums IP Networking Incomplete three way handshake Post 302147004 by 3wayTrouble on Friday 23rd of November 2007 10:34:07 AM
Old 11-23-2007
Incomplete three way handshake

I've got a strange problem with a single mail sender (it is one of
those large free mail providers). My mail server works well with
thousands of senders but not this one, so we have made a connection
dump and it seems that the three way handshake is not completed

15:55:59.177431 IP ServerA.44601 > ServerB.25: S
2660877349:2660877349(0) win 5840 <mss 1380,sackOK,timestamp
3138006451 0,nop,wscale 0>
15:55:59.177751 IP ServerB.25 > ServerA.44601: S
4129790087:4129790087(0) ack 2660877350 win 5792 <mss
1460,sackOK,timestamp 2017496649 3138006451,nop,wscale 2>
15:56:02.972255 IP ServerB.25 > ServerA.44601: S
4129790087:4129790087(0) ack 2660877350 win 5792 <mss
1460,sackOK,timestamp 2017497598 3138006451,nop,wscale 2>
15:56:02.986696 IP ServerA.44601 > ServerB.25: . ack 1 win 5792 <mss
1460,sackOK,timestamp 2017497598 3138006451,nop,wscale 2>
15:56:02.986740 IP ServerB.25 > ServerA.44601: . ack 1 win 5792
<nop,nop,timestamp 2017497601 3138006451>
15:56:08.972156 IP ServerB.25 > ServerA.44601: S
4129790087:4129790087(0) ack 2660877350 win 5792 <mss
1460,sackOK,timestamp 2017499098 3138006451,nop,wscale 2>
15:56:08.987170 IP ServerA.44601 > ServerB.25: . ack 1 win 5792 <mss
1460,sackOK,timestamp 2017499098 3138006451,nop,wscale 2>
15:56:08.987192 IP ServerB.25 > ServerA.44601: . ack 1 win 5792
<nop,nop,timestamp 2017499101 3138006451>
15:56:20.972071 IP ServerB.25 > ServerA.44601: S
4129790087:4129790087(0) ack 2660877350 win 5792 <mss
1460,sackOK,timestamp 2017502098 3138006451,nop,wscale 2>
15:56:20.986619 IP ServerA.44601 > ServerB.25: . ack 1 win 5792 <mss
1460,sackOK,timestamp 2017502098 3138006451,nop,wscale 2>
15:56:20.986672 IP ServerB.25 > ServerA.44601: . ack 1 win 5792
<nop,nop,timestamp 2017502101 3138006451>
15:56:45.175830 IP ServerB.25 > ServerA.44601: S
4129790087:4129790087(0) ack 2660877350 win 5792 <mss
1460,sackOK,timestamp 2017508149 3138006451,nop,wscale 2>
15:56:45.190617 IP ServerA.44601 > ServerB.25: . ack 1 win 5792 <mss
1460,sackOK,timestamp 2017508149 3138006451,nop,wscale 2>
15:56:45.190664 IP ServerB.25 > ServerA.44601: . ack 1 win 5792
<nop,nop,timestamp 2017508152 3138006451>
15:57:33.375347 IP ServerB.25 > ServerA.44601: S
4129790087:4129790087(0) ack 2660877350 win 5792 <mss
1460,sackOK,timestamp 2017520199 3138006451,nop,wscale 2>
15:57:33.389931 IP ServerA.44601 > ServerB.25: . ack 1 win 5792 <mss
1460,sackOK,timestamp 2017520199 3138006451,nop,wscale 2>
15:57:33.389981 IP ServerB.25 > ServerA.44601: . ack 1 win 5792
<nop,nop,timestamp 2017520202 3138006451>


Someone can give me some advice? What I see is simply a strange mss
size at the beginning of 1380 that is not very usual but I am not sure
if it is relevant or not.
 

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eXosip_event(3) 						    libeXosip2							   eXosip_event(3)

NAME
eXosip_event - SYNOPSIS
#include <eXosip.h> Data Fields eXosip_event_type_t type char textinfo [256] void * external_reference osip_message_t * request osip_message_t * response osip_message_t * ack int tid int did int rid int cid int sid int nid int ss_status int ss_reason Detailed Description Structure for event description Field Documentation eXosip_event_type_t eXosip_event::type type of the event char eXosip_event::textinfo[256] text description of event void* eXosip_event::external_reference external reference (for calls) osip_message_t* eXosip_event::request request within current transaction osip_message_t* eXosip_event::response last response within current transaction osip_message_t* eXosip_event::ack ack within current transaction int eXosip_event::tid unique id for transactions (to be used for answers) int eXosip_event::did unique id for SIP dialogs int eXosip_event::rid unique id for registration int eXosip_event::cid unique id for SIP calls (but multiple dialogs!) int eXosip_event::sid unique id for outgoing subscriptions int eXosip_event::nid unique id for incoming subscriptions int eXosip_event::ss_status current Subscription-State for subscription int eXosip_event::ss_reason current Reason status for subscription Author Generated automatically by Doxygen for libeXosip2 from the source code. Version 3.1.0 Sun Jun 24 2012 eXosip_event(3)
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