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

[Bruce Komito]

I've tried double NAT and it doesn't work.  Your only chance is to run
everything behind the Netgear bridged.  Even then, if you are using
wireless bridges, you will need to make sure the arp entries do not fall
out of the bridge(s) due to lack of activity.  One way to do this is to
make sure they are re-registering often.  I'm sure there are other ways to
deal with this, but that is what worked for me.

Bruce Komito
High Sierra Networks, Inc.
www.servers-r-us.com
(775) 236-5815


On Mon, 1 Nov 2004, Paul Rodan wrote:

> 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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