Asterisk Sees Private IP Address Of A Device Behind NAT

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Asterisk Users 1 Comment

Hello,

my asterisk is working fine, I am just confused why, on the server I see private IP address of an endpoint:

WARNING: Retransmission timeout reached on transmission
0_252301488@10.1.3.8 for seqno 2 (Critical Response)

the IP 10.1.3.8 is a phone behind NAT. Does it mean something is misconfigured?
Shouldn’t asterisk only see the public IP of the router ?

thanks,

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One thought on - Asterisk Sees Private IP Address Of A Device Behind NAT

  • SIP is rather like FTP in that it embeds IP addresses (layer 3 of the OSI
    network model) in the protocol itself (layer 7). I have always found it amazing that after we’d been struggling with this design flaw in FTP for years, it was decided to repeat it in RFC 2543.

    It is one of the reasons why SIP through NAT is more challenging than, say, HTTP is, and one of its side effects is that you often see “real” (private) IP
    addresses of endpoints inside the communications when the packet source and destination addresses are the routed (public) versions.

    Unless you experience actual problems in call setup or take-down, or things like one-way audio, just ignore it and accept that SIP was perhaps not as well designed as it could have been.

    Antony.

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    People say that nothing is impossible, so I try to do the impossible every day.

    Please reply to the list;
    please *don’t* CC me.

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