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Double NAT (2 router setup)??

B

bobn4burton

Gawd
Joined
Aug 19, 2002
Messages
722
Ok so I have Qwest DSL with an Actiontec wireless modem/router. I also have the Linksys wrt54g router with dd-wrt firmware on it. I've just had it setup as a double NAT with the linksys behind the Actiontec router. I do have the linksys on the DMZ of the Actiontec to avoid double forwarding of ports.

Soooo...I know that there is a performance hit to have a double NAT, but I'm not sure how much of a hit it is. I play online games a lot and so latency is pretty important to me. So I have a few questions that I hoped you experts could help me out with...

1. How much of a performance hit is there going through a double NAT? Anything actually noticable?

2. I've read that I might be able to avoid the double NAT situation by setting my actiontec into a bridge mode and my linksys in a PPPoE mode? Would this work? As a side note, Qwest (at least my account anyways) uses PPPoA, if that changes anything.

3. Any other options I have to avoide the double NAT? (besides just not using my linksys router? I need the extra features I get from the wrt54g+dd-wrt)

4. Or should I not even be worried about the double NAT situation??

Thanks in advance!!
 
Little update...

I just tried connecting with PPPoE and it seems to work ok. So if it makes any difference or or makes it easier...it appears I can connect with PPPoE just fine.
 
To turn off NATing on the Linksys router, change it from "gateway" mode to "router" mode.
 
Ok...I got it to work. I just set the modem to 'transparent bridged' mode and then set my linksys to use PPPoE with my username and password and it connected right up.

I haven't done any speed testing yet, browsing the web feels the same. I'll have to see if I notice any difference when gaming this weekend.

If anyone has any extra info about performance, I'm still interested in hearing...
 
All things being equal, there shouldn't be a big difference in performance. Nothing more than 10 ms difference (max, more like 1 ms) I'd think, which is barely, if at all, noticable.
 
bobn4burton said:
If anyone has any extra info about performance, I'm still interested in hearing...
Click to expand...

Some programs don't get along well with double NAT. Granted yes you can get double NAT to work, but as you do it more often with lesser..home grade gear....some online applications simply don't like double NAT, they get flakey.

Doing what you did..flip the ISP supplied gateway appliance to be just a dumb modem/bridge..and let your own router do the login authentication and NAT...that's the best way to do it (assuming your own router is higher performance than the gateway appliance the ISP supplied you with).
 
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