jezzzz .
2006-Dec-11 15:22 UTC
[asterisk-users] Using SIP with NAT (technical code question)
In chan_sip.c, line 5876 (Asterisk-1.2.13), the
function parse_ok_contact returns whether the host
that requested an invite is a valid or invalid host.
In line 5925 the following clause is tested:
if (!(ast_test_flag(pvt, SIP_NAT) & SIP_NAT_ROUTE))
hp = ast_gethostbyname(n, &ahp);
If this clause is true then Asterisk will attempt to
retrieve the IP address by using the hostname provided
in the invite.
My question is, is this test always going to be true
if a user (who receives the invite) uses NAT? (this is
set up in sip.conf as nat=yes) Is there a reason why
this was set up only for NAT?
Thanks,
Jez
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Bob Chiodini
2006-Dec-11 16:08 UTC
[asterisk-users] Using SIP with NAT (technical code question)
It looks to me that if the test clause is false then ast_gethostbyname is called. Presumably not needed when NAT is enabled. Bob... jezzzz . wrote:> In chan_sip.c, line 5876 (Asterisk-1.2.13), the > function parse_ok_contact returns whether the host > that requested an invite is a valid or invalid host. > > In line 5925 the following clause is tested: > > if (!(ast_test_flag(pvt, SIP_NAT) & SIP_NAT_ROUTE)) > hp = ast_gethostbyname(n, &ahp); > > If this clause is true then Asterisk will attempt to > retrieve the IP address by using the hostname provided > in the invite. > > My question is, is this test always going to be true > if a user (who receives the invite) uses NAT? (this is > set up in sip.conf as nat=yes) Is there a reason why > this was set up only for NAT? > > Thanks, > > Jez > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
jezzzz .
2006-Dec-11 17:24 UTC
[asterisk-users] Using SIP with NAT (technical code question)
My mistake, I misread it. So if a hostname is provided (e.g. user@domain.com) instead of an IP (e.g. 123.123.123.123) and the recipient of the INVITE is not using NAT then ast_gethostbyname will be run - is that correct? In this case, why the distinction between a NATted and non_NATted implementation? --- Bob Chiodini <bchiodini@gmail.com> wrote:> It looks to me that if the test clause is false then > > ast_gethostbyname is called. Presumably not needed > when NAT is enabled. > > Bob... > > jezzzz . wrote: > > In chan_sip.c, line 5876 (Asterisk-1.2.13), the > > function parse_ok_contact returns whether the host > > that requested an invite is a valid or invalid > host. > > > > In line 5925 the following clause is tested: > > > > if (!(ast_test_flag(pvt, SIP_NAT) & > SIP_NAT_ROUTE)) > > hp = ast_gethostbyname(n, &ahp); > > > > If this clause is true then Asterisk will attempt > to > > retrieve the IP address by using the hostname > provided > > in the invite. > > > > My question is, is this test always going to be > true > > if a user (who receives the invite) uses NAT? > (this is > > set up in sip.conf as nat=yes) Is there a reason > why > > this was set up only for NAT? > > > > Thanks, > > > > Jez > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! Mail has the best spam > protection around > > http://mail.yahoo.com > > _______________________________________________ > > --Bandwidth and Colocation provided by > Easynews.com -- > > > > asterisk-users mailing list > > To UNSUBSCRIBE or update options visit: > > >http://lists.digium.com/mailman/listinfo/asterisk-users> > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com > -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > >http://lists.digium.com/mailman/listinfo/asterisk-users>____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com
Bob Chiodini
2006-Dec-12 05:09 UTC
[asterisk-users] Using SIP with NAT (technical code question)
You might want to pass that one by the asterisk-dev list. Bob... On Mon, 2006-12-11 at 15:18 -0800, jezzzz . wrote:> My mistake, I misread it. So if a hostname is provided > (e.g. user@domain.com) instead of an IP (e.g. > 123.123.123.123) and the recipient of the INVITE is > not using NAT then ast_gethostbyname will be run - is > that correct? In this case, why the distinction > between a NATted and non_NATted implementation? > > --- Bob Chiodini <bchiodini@gmail.com> wrote: > > > It looks to me that if the test clause is false then > > > > ast_gethostbyname is called. Presumably not needed > > when NAT is enabled. > > > > Bob... > > > > jezzzz . wrote: > > > In chan_sip.c, line 5876 (Asterisk-1.2.13), the > > > function parse_ok_contact returns whether the host > > > that requested an invite is a valid or invalid > > host. > > > > > > In line 5925 the following clause is tested: > > > > > > if (!(ast_test_flag(pvt, SIP_NAT) & > > SIP_NAT_ROUTE)) > > > hp = ast_gethostbyname(n, &ahp); > > > > > > If this clause is true then Asterisk will attempt > > to > > > retrieve the IP address by using the hostname > > provided > > > in the invite. > > > > > > My question is, is this test always going to be > > true > > > if a user (who receives the invite) uses NAT? > > (this is > > > set up in sip.conf as nat=yes) Is there a reason > > why > > > this was set up only for NAT? > > > > > > Thanks, > > > > > > Jez > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Tired of spam? Yahoo! Mail has the best spam > > protection around > > > http://mail.yahoo.com > > > _______________________________________________ > > > --Bandwidth and Colocation provided by > > Easynews.com -- > > > > > > asterisk-users mailing list > > > To UNSUBSCRIBE or update options visit: > > > > > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > > _______________________________________________ > > --Bandwidth and Colocation provided by Easynews.com > > -- > > > > asterisk-users mailing list > > To UNSUBSCRIBE or update options visit: > > > > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > > > > ____________________________________________________________________________________ > Do you Yahoo!? > Everyone is raving about the all-new Yahoo! Mail beta. > http://new.mail.yahoo.com > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users