26 Jun
2003
26 Jun
'03
11:26 p.m.
Andrei Pelinescu-Onciul wrote:
On Jun 26, 2003 at 12:22, Jamin W. Collins
<jcollins(a)asgardsrealm.net> wrote:
Not quite. Run-time reverse DNS lookups also performed when you are
doing comparisons involving src_ip.
-Maxim
When does SER perform DNS lookups? Is it a matter
of how the entry is
made in the ser.cfg? I ask because one of our customers changed their
DNS servers and the SER proxy was not updated. In the ser.cfg all
routing is done by IP (or I had thought it was). However, the site
started experiencing some very odd call drops and after updating the
resolv.conf on the proxy server with the proper DNS servers (one of them
had changed) everything was fine.
DNS lookups for the addresses in ser.cfg are performed only once, on ser
startup immediately after reading the cfg. file.
Should IP address entries be quoted or non-quoted?
It doesn't matter (they have to be quoted for modules functions, like
t_relay_to, they can be unquoted for forward*(...) ).
Does the presence of
the quotes cause a DNS lookup even though the item in them is purely
numeric (i.e. "162.128.33.54").
No. Internal ser resolve functions will be called, but in the default
compilation (with -DDNS_IP_HACK added) they will recognize ipv4 & ipv6
addresses and no dns lookup will be performed.
Runtime DNS lookups for requests are performed only for forward (uri:host),
t_relay() and other uri involving forwarding functions.