[Asterisk-Users] SIP via Wireless Ethernet Bridge and Double NAT

[Paul Rodan]

Just moved into a new place and it'll take 2-3 weeks for my SDSL to be
installed.

 

Anyways, found an unsecured wireless network going through my new townhouse
at 30% strength. Found the owner and they said I could share it for a couple
of weeks.

 

They have a Netgear, 108mbs 802.11 b/g. So I took a LinkSys WAP54g and put
it in Ethernet bridge mode, it took the signal and converted it to Ethernet
for me. I then plugged it into my Belkin 4 Wireless Router w/ 4 port switch.
So now I'm redistributing the connection in my townhouse. I plugged a Cisco
ATA-186 into the Belkin, but it's having problems registering with the
Asterisk server. I figured the double NAT was messing it up.  I'm getting
less than 1% packet loss to the internet, so the link is strong.

 

Cable Modem <-Ethernet-> Netgear Wireless Router <-----802.11-----> LinkSys
WAP54G <-Ethernet-> Belkin Router <-Ethernet-> Cisco ATA186.

 

I keep seeing sip registration failed requests on Asterisk. I checked and
double checked the passwords, its fine. I believe it's that the device gets
the UDP packets through to the Asterisk server fine, with the authentication
information or whatever; but when the Asterisk server tries to respond via
UDP, it doesn't make it through. So it fails.

 

I tried port forwarding 5060:5061 and 10000:20000 from the Netgear to the
Belkin and then to the Cisco, but no luck. It could be the double NAT, or
one of them isn't properly NAT'ing in order for VOIP to work. I believe it
could be the Netgear, as I think I've used the Cisco behind the Belkin in
the past without a problem. Either that, or maybe UDP doesn't work across
wireless links so well. My only other thing to try is to put a 5 port switch
between the LinkSys WAP54g and the Belkin and plug my Cisco ATA 186 and my
Belkin into it. This way the Cisco ATA 186 is only behind the Netgear NAT,
not behind the Belkin NAT. 

 

 

Cable Modem <-Ethernet-> Netgear Wireless Router <-----802.11-----> LinkSys
WAP54G <-Ethernet-> 5 Port Switch <-Ethernet-> Belkin Router

 
<-Ethernet-> Cisco ATA186

 

 

Anyways, just wanted to see if anybody has tried something as exotic or
similar? Anybody had problems with Netgear or Belkin NAT devices? Or
Wireless links? 

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