14 Dec
2006
14 Dec
'06
7:14 p.m.
Hi George,
TLS = Thread Local Storage
Papadopoulos Georgios wrote:
Hello,
I am having some performance issues with Openser and I tend to believe
they are related with DNS. So I am trying to figure out when and why
Openser is doing DNS queries. Doing ngrep on port 53 I realized that
right before sending out the "100 trying -- your call is important to
us" message, Openser is doing a reverse DNS lookup for the IP where
the INVITE came from. So the sequence is something like:
client Openser DNS
|---INVITE------------------------>|
|<---407 Proxy Auth Reqd---|
|---ACK--------------------------->|
|---INVITE------------------------>|
|---client IP?-------->|
|<-------------------------|
|<--------------------100 trying---|
I am using Openser-1.1.0-notls and in my script I have
dns=no
rev_dns=no
So first question is whether this DNS query is necessary and how I
could avoid it.
the configuration options are ok (as time you do not use the command
line -r or -R). I would say the rev dns query is not triggered by the
t_relay() (actually the params control what DNS queries should be done
when testing the "received" VIA param) - I have tested and I see no
query before 100 trying, so it should be ok.
maybe you are using some nat test functions (like client_nat_test) or
any other script functions that mask a dns query...can you check on this?
What is furthermore confusing is that I have a test system with the
same Openser version and same script, where this DNS query is not
happening. Looking into the production system I found the following:
ser2:/usr/local/openser-1.1.0-notls/sbin# ldd openser
linux-gate.so.1 => (0xffffe000)
libdl.so.2 => /lib/tls/libdl.so.2 (0x55571000)
libresolv.so.2 => /lib/tls/libresolv.so.2 (0x55574000)
libc.so.6 => /lib/tls/libc.so.6 (0x55587000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x55555000)
whereas the test system shows:
sertest:/usr/local/openser-1.1.0-notls/sbin# ldd openser
libdl.so.2 => /lib/libdl.so.2 (0x7002c000)
libresolv.so.2 => /lib/libresolv.so.2 (0x70040000)
libc.so.6 => /lib/libc.so.6 (0x70064000)
/lib/ld-linux.so.2 (0x70000000)
So the two systems link to different libresolv.so libraries. Is the
tls/libresolve.so that is responsible for the DNS query? Given that in
both cases I am using the notls version of Openser 1.1, why is there a
difference between the two?
the "tls" frm /lib/tls comes from "Thread Local Storage" and there are
libraries implementations for thread env. It has nothing to do with TLS
(Transport Layer Security)
regards,
bogdan
thank you for any help
George
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