[Serdev] [Tracker] Created: (SER-200) Patch for a new nathelper nat_uac_test (Contact != rport)

Nils Ohlmeier (JIRA) tracker at iptel.org
Mon Dec 18 13:15:05 UTC 2006


Patch for a new nathelper nat_uac_test (Contact != rport)
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                 Key: SER-200
                 URL: http://tracker.iptel.org/browse/SER-200
             Project: SER
          Issue Type: Improvement
          Components: NAT Traversal
    Affects Versions: Ipteldorf
         Environment: Latest CVS code (Ottendorf version) from the 18.12.2006.
            Reporter: Nils Ohlmeier
            Priority: Minor
         Attachments: nathelper_contact_rport_test.patch

The attached patch adds one more test to the nat_uac_test (0x20) which compares the port in the Contact header with the port value from the transport layer (UDP/TCP). This test can be helpful in scenarios with clients behind symmetric NATs and STUN support, where the wrong Contact header port may be the only indication for a NAT traversal, but not fixing these values breaks the further in-dialog communication. But be warned that this test should not be used by default, as it might break things for example in cases where UA's are on a public IP and advertising a different port in their Contact header with intention.

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