[Asterisk-Users] IOS Bug crashing SIP nat sessions

[Christopher J. Wolff]

Hello,   If you currently experience frequent Cisco router crashes be advised that there is an IOS bug triggered by sip sessions NAT’d through the router.  The bug is NOT fixed unlike what is said here.  This issue is reopened at Cisco under bug CSCeb12516.  with a severity of 2 because it sucks a$$.  Forgive me for posting in HTML.   CSCdz14900 Bug Details Headline  Software forced crash ipnat_l4_udp_sip_fixup Product  all Model   Component  nat Duplicate of   Severity  3  Severity help Status  Resolved  Status help First Found-in Version  12.3, 12.2(11)T, 12.2(15)B   All affected versions First Fixed-in Version  12.3(2.3), 12.3(0.5)B03a, 12.3(3.1)T, 12.3(2.3)B  Version help Release Notes   A Cisco router running IOS 12.2.T may reload due to a software forced crash. Currently the root cause has not been found, but early indications are that this is related to NAT. Workaround: turn off NAT SIP ALG by the following CLI can be used to avoid this crash - of course you will lose NAT SIP support. no ip nat service sip tcp port 5060 no ip nat service sip udp port 5060 Feedback Please rate this release note: Select One Excellent Good Average Fair Poor If you gave this release note a low rating, please tell us why. Select One The information is not clear The information is incomplete The information is not related to my issue       Regards, Christopher J. Wolff, VP CIO Broadband Laboratories, Inc. http://www.bblabs.com

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