[Freeswitch-users] SIP Invite IP fragmentation issue

Saurabh Aggarwal saurabh_aggarwal at hotmail.com
Tue Nov 18 02:42:21 PST 2008

enabling compact headers - what is that?

Date: Tue, 18 Nov 2008 04:29:28 -0600From: krice at suspicious.orgTo: freeswitch-users at lists.freeswitch.orgSubject: Re: [Freeswitch-users] SIP Invite IP fragmentation issueIts not really possible other then enabling compact headers or by getting rid of codecs that you don’t actually want to use... Another thing you could do is get your broken ISP to fix their firewall... It is not correct to just drop fragmented packets just because they are fragmented.. This is something that will happen on a regular basis on the internet as not everything has an MTU of 1500

From: Saurabh Aggarwal <saurabh_aggarwal at hotmail.com>Reply-To: <freeswitch-users at lists.freeswitch.org>Date: Tue, 18 Nov 2008 10:19:55 +0000To: <freeswitch-users at lists.freeswitch.org>Subject: Re: [Freeswitch-users] SIP Invite IP fragmentation issueOk, my bad. Ethereal for some reason was showing only the first fragment (ethereal bug?). But, now it seems I have hit another problem - it seems that the SIP invites (which are fragmented) are being dropped by the firewall in between us and the SIP provider. Is it possible to shrink the size of the SIP invite so that it fits in a single packet? Any optional stuff in the SIP invite that is sent, that can be thrown away? -Saurabh

From: saurabh_aggarwal at hotmail.comTo: freeswitch-users at lists.freeswitch.orgDate: Tue, 18 Nov 2008 07:34:11 +0000Subject: [Freeswitch-users] SIP Invite IP fragmentation issueI am having an *odd* issue, which i am not sure freeswitch is to be blamed for. Sometimes, the SIP invites are bigger than 1500 bytes causing IP fragmentation, but when I look at the TCP dump (on the same machine as freeswitch), I see that only the first packet of the fragment is captured. Is freeswitch trying to do its own IP fragmentation or is it relying on underlying linux (kernel 2.6.18)? I created a small program to send UDP packets of 2000 bytes, and also tried with ping -s 2000, and both were successful, so am leaning towards blaming Freeswitch. Any suggestions? -Saurabh 

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