Please help icmp destination unknown port unknown

gbwien · 09-02-2011, 04:38 AM

Hi,

thanks, i have some network issues which are taking time to resolve....

hi2arun · 09-02-2011, 04:40 AM

Sure. And thanks for all 'yes'

gbwien · 09-02-2011, 07:16 AM

Hi,

I tried echo 1 > /proc/sys/net/ipv4/ip_forward but I still don't see in wireshark any response ?

thanks
graham

gbwien · 09-02-2011, 07:18 AM

Hi

I tried

echo 1 > /proc/sys/net/ipv4/ip_forward but no luck

thanks
graham

hi2arun · 09-02-2011, 07:21 AM

Perhaps, you might have to check your server configuration.

Well.. letz do a small debugging to find out if your server is good.

Do you have 'nc' in your Linux instance?

gbwien · 09-02-2011, 07:24 AM

Maybe there is something not right with iptables

---------- Post added 09-02-11 at 02:25 PM ----------

yes i have nc installed

gbwien · 09-02-2011, 07:26 AM

if i type nc i get to

cmd line

hi2arun · 09-02-2011, 07:32 AM

This is what I wanted to check...

1. Stop the SIP server running in Linux instance.

2. Enable ip_forward and have iptables rule configured as discussed

3. Run 'nc' to listen on 127.0.0.1, udp mode, port 5060

4. Start SIP client from host

5. Once SIP client sends a request, you will notice it on the terminal where 'nc' is running

6. Once you saw a request, type something on 'nc' terminal and check if the typed message went back to SIP client.

If everything happened properly, you have to revisit SIP server's configuration.

gbwien · 09-02-2011, 07:34 AM

thanks

hi2arun · 09-02-2011, 07:39 AM

Did you notice SIP client's request on 'nc' terminal?

gbwien · 09-02-2011, 07:53 AM

Hi,

I ran the above, but noting is written to the screen

instead I just see that nc responds with

localhost.localdomain 127.0.0.1 5060 (?) open

hi2arun · 09-02-2011, 07:58 AM

Ok.. now,

1. delete the iptables command

Assuming you have only one iptables rule in nat table...

Quote:

iptables -t nat -F

2. Run nc listening on all interface and see if you get the request on screen.

gbwien · 09-02-2011, 08:11 AM

Hi I ran the test again,

but still nothing on nc output

hi2arun · 09-02-2011, 08:13 AM

Can you post the output of

Quote:

netstat -anup

after you executed 'nc'?

gbwien · 09-02-2011, 08:17 AM

Code:

[root@grahamb ~]# netstat -anup
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
udp        0      0 0.0.0.0:32768               0.0.0.0:*                               3598/named
udp        0      0 127.0.0.1:32789             127.0.0.1:5060              ESTABLISHED 11043/nc 
udp        0      0 127.0.0.1:6060              0.0.0.0:*                               11050/ser
udp        0      0 192.168.21.128:53           0.0.0.0:*                               3598/named
udp        0      0 127.0.0.1:53                0.0.0.0:*                               3598/named
udp        0      0 127.0.0.1:5060              0.0.0.0:*                               11008/ser
udp        0      0 127.0.0.1:4060              0.0.0.0:*                               9713/ser 
udp        0      0 0.0.0.0:111                 0.0.0.0:*                               3656/portmap
udp        0      0 0.0.0.0:884                 0.0.0.0:*                               3676/rpc.statd
udp        0      0 0.0.0.0:887                 0.0.0.0:*                               3676/rpc.statd
udp        0      0 0.0.0.0:631                 0.0.0.0:*                               3137/cupsd
udp        0      0 :::32769                    :::*                                    3598/named