[Serusers] Nathelper question
Alex Bligh
alex at alex.org.uk
Sat Jul 10 12:36:22 CEST 2004
--On 10 July 2004 15:31 +1000 Zeus Ng <zeus.ng at isquare.com.au> wrote:
> if (method=="INVITE") {
> if (isflagset(4) && isflagset(5)) { /* NAT source & NAT dest. */
> if (!exec_msg('echo $SIP_RURI | cut -d: -f2 | cut -d@ -f2 | grep
> "$SIP_SRCIP" > /dev/null')) {
> xlog("L_NOTICE", "UAs behind different NAT devices, forcing
> rtpproxy\n");
> force_rtp_proxy();
> t_on_reply("2");
> } else {
> xlog("L_NOTICE", "UAs behind same NAT devices\n");
> t_on_reply("3");
> }
> ... Other situation, NAT -> Public, Public -> NAT ...
> }
>
For the sake of pedantry, I think that test will give a false positive
(i.e. wrongly treat caller and callee as being behind the same NAT)
in situations similar to:
10.0.0.1 A -> NAT1 -192.168.0.1 \
|--> NAT3 --> 195.1.1.1 Internet
10.0.0.2 B -> NAT2 -192.168.0.2 /
Alex
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