Double NAT'ing, is it really that bad?

mark2410

mark2410

mark2410

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So ive just changed ISP to talk talk with their VDSL service.

the modem/router from them is in a cupboard with the BT master socket but my main router is in the livengroom. Previously i had the cupboard one running as a modem only and let my WNDR4500 in the livingroom be the router.

however the hg633 thing from talk talk doesnt have a modem only mode so atm my network is doeble NAT'ed. so far i cant say ive actually noticed any issues (its been been up less than a day) but ive seen doeble Nat'ing as a terrible thing, so is it really? am i missing something?
 
If the only thing plugged into the "outer" one is the "inner" one then you might be fine. Maybe check port forwarding works?
 
well so far ive noticed zero difference. since the death of free dyndns i use teamspeak if i ever need to access my comp when out but thats V rare, but nothing seems broken. thats not to say things arent but ive not noticed anything so far.
 
As you're on VDSL would it not be better to get a cheap HG612 3B modem from eBay and put that in the cupboard? Double NAT is just horrible when it comes to port forwarding.
 
Double NATing is only a problem if something breaks.

Personally I'd leave the TalkTalk box as the only router and configure the WNDR4500 as an access point.
 
mrkev said:
As you're on VDSL would it not be better to get a cheap HG612 3B modem from eBay and put that in the cupboard? Double NAT is just horrible when it comes to port forwarding.
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the 612 doesnt support G.NIP which may be an issue

bremen1874 said:
Double NATing is only a problem if something breaks.

Personally I'd leave the TalkTalk box as the only router and configure the WNDR4500 as an access point.
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no, ive got my wndr4500 and the thome network set up all with fixed assigned ip and not ontyl dant i ithkn the tt box allows, id be reluctant to loose it.

Avalon said:
Does the 633 support DMZ?
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erm yes i believe it does, why?

Caged said:
Did you have somebody else's FTTC before?
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eh? nope before i had plain old adsl2+ from sky, whos router had a modem only mode.
 
mark2410 said:
erm yes i believe it does, why?
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I think I see where Avalon is going with that - place the WNDR4500 in a DMZ, effectively disabling all the filtering in the HG633 and exposing the WNDR4500 to the internet. Would behave similarly to the HG633 in modem mode.
 
The HG633 has a bridge mode. Turn this on as follows

Step 1 Set the working mode of the HG533 to Bridge.
1. Log in to the web-based configuration utility of the HG533.
2. In the navigation tree on the left of the web-based configuration
utility, choose Basic > WAN.
8
3. Select Enable for WAN connection.
4. Enter the VPI and VCI parameters that are provided by the network
operator in the VPI/VCI text boxes.
5. Select INTERNET from the Service list.
6. Select Bridge from the Connection type drop-down combo box.
7. Keep the default settings of other parameters.
8. Click Submit.

Then on the WNDR4500 set the Internet Service Type to PPPoE and enter your ISP login details here.

Should put the public IP onto the WNDR.
 
joeyjojo said:
I think I see where Avalon is going with that - place the WNDR4500 in a DMZ, effectively disabling all the filtering in the HG633 and exposing the WNDR4500 to the internet. Would behave similarly to the HG633 in modem mode.
Click to expand...

Yep, in theory it's a quick/easy solution in situations where devices won't run in 'modem only' mode. If you can get bridge working though then do it.
 
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