[asterisk-users] Problem connecting to 4569/UDP

[kazabe]

Hi.

Im trying to connect 2 asterisk servers between linux firewalls (iptables).

Im using exactly the same iptables script in both firewall servers,
but i dont obtain the same answer in both.

this is the scenarie.

[ASTERISK-NetA]-----[FIREWALL-NetA]-----INTERNET---[FIREWALL-NetB]----[ASTERISK-NetB]

Now i do a test on NetA

<Test on net A>

root at FIREWAL-NetA# nmap -sU -sV -p4569  public.ip.net.B

Starting Nmap 5.00 ( http://nmap.org ) at 2012-01-03 12:17 GMT
Interesting ports on public.ip.net.B (5.6.7.8):
PORT     STATE SERVICE VERSION
4569/udp open  iax2

</Test on net A>

All fine.  Now i test the NetB

<Test in net B>

root at FIREWAL-NetB# nmap -sU -sV -p4569  public.ip.net.A

Starting Nmap 5.00 ( http://nmap.org ) at 2012-01-03 12:24 GMT
Interesting ports on public.ip.net.A (1.2.3.4):
PORT     STATE SERVICE VERSION
4569/udp open  iax2

</Test in net B>

Fine too.   But when i do a ping test to the udp port, the answer is
not the same:

<Ping From A>
root at FIREWAL-NetA# hping3 public.ip.net.B --udp -V -p 4569
using eth0, addr: 1.2.3.4, MTU: 1500
HPING public.ip.net.B (eth0 1.2.3.4): udp mode set, 28 headers + 0 data bytes
len=46 ip=5.6.7.8 ttl=57 id=60657 tos=18 iplen=40 seq=0 rtt=0.0 ms
len=46 ip=5.6.7.8 ttl=57 id=60658 tos=18 iplen=40 seq=0 rtt=0.0 ms
len=46 ip=5.6.7.8 ttl=57 id=60659 tos=18 iplen=40 seq=0 rtt=0.0 ms
^C
--- public.ip.net.B hping statistic ---
19 packets transmitted, 3 packets received, 85% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms

</Ping From A>

Ping From A work Fine; but Ping from B obtain a "Port Unreachable"

<Ping From B>
root at FIREWAL-NetB# hping3 public.ip.net.A --udp -V -p 4569
using eth0, addr: 5.6.7.8, MTU: 1500
ICMP Port Unreachable from ip=1.2.3.4 name=UNKNOWN
ICMP Port Unreachable from ip=1.2.3.4 name=UNKNOWN
ICMP Port Unreachable from ip=1.2.3.4 name=UNKNOWN
ICMP Port Unreachable from ip=1.2.3.4 name=UNKNOWN
^C
--- 1.2.3.4 hping statistic ---
31 packets transmitted, 4 packets received, 88% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms

</Ping From B>

So both Asterisk servers cant be connected.

What can i check?  i dont understand why if use the same rules, the
answer is different.

Thanks in advance for your help.