router connected to modem and static IP

[i_was_here]

I have a Linksys WRT54G connected to a Speedstream 5100 (DSL modem provided by AT&T) and I need to have some port forwarded.

However to forward ports, I need a static IP but I don't know where it should be set and what settings I should change. Any help?

BTW Im running Linux.

[aussiefloyd_fan]

log into the router and set it to static ip... should be goody to go

[i_was_here]

So I can leave my OS network setting as DHCP? And I leave the PPPoE info on the modem?

[+BudMan MVC]

For starters you don't need a static to forward a port to your ip.. Why they suggest a static is because with dhcp your IP could change.. But there is nothing stopping you from forwarding to a ip that was obtained by dhcp. You just need to understand if the IP changes, your forward will no longer be working, and if some other machine gets that IP the forward will be going to it.

And vs setting the static on the linux box, why don't you just set a reservation on your dhcp server to always give that machine the same IP.

Also -- since your on dsl, I would bet your prob double natting.. Unless that ROUTER you got from att is set to bridge mode?

http://www.dslreports.com/faq/sbc/3.1_Speedstream_5100#8722

How can I put the 5100b in bridge mode? (#8722)

http://www2.windstream.net/downloads/links...edStream211.pdf

Congratulations on your purchase of the SpeedStream?Router> with SecureRouteTM.

Note This manual covers theSpeedStream model series 5100>, 5200, 5400 and 5500.

Which is going to cause you issues with forwarding ports. I would sugggest you put your speedstream into bridge mode so that only your wrt54g is doing nat.

As to setting a static on linux.

http://thedaneshproject.com/posts/how-to-c...ic-ip-in-linux/

How to configure a static ip in Linux

You could also have a gui way to do it, or it might be in bit different -- depends on what distro of linux your running.

[i_was_here]

@BudMan thanks for the info. I have two questions, when I set my modem to bridge mode, do I have to make the router initiate the PPPoE? Secondly, do I need to set both the router and OS for static IP?

[+BudMan MVC]

If your bridge mode then yes most likely you would need to set the wrt54 to do your PPPoE login..

The link I pointed pretty clearly points that out does it not??

10. Reboot your computer and router (if applicable.) You will now need some form of PPPoE software on your computer or a router that supports PPPoE. Be warned that even if you are using Enternet 300 or XP/OSX's built in PPPoE SBC tech support will not troubleshoot connectivity issues until you have put your modem back in PPPoE on board mode.

Um as to setting the router to static?? No your router would not be in static mode..

If your att router is in bridge mode -- it will be acting as just a "modem" and your router will get a Public IP from your ISP, using your PPPoE login info.. You would not set this to static -- unless you have static IP from your ISP??

You would then forward whatever port you want on the wrt54g to the IP address of the machine you want the forward to go to.. This machines IP could be static or dhcp - does not really matter.. Just remember that if dhcp IPs can change, etc.. So prob set a reservation on your routers dhcp server (not sure if the native firmware of linksys wrt54g supports that, but dd-wrt does) or set your machines IP to static so that it always has the same IP address on your routers private network 192.168.x.x

[robyholmes]

Depending on your ISP, in it UK ISP's use PPPoA which can not be used in bridge mode, so setting the router in 'Automatic' or 'Static IP' and creating a DMZ on the modem for .2 and WAN IP on the WRT54G as .2 will allow for the the WRT54G firewall to do all the work, and not the modem.

If you need more on this then please say and I will come back and post in information.

[+BudMan MVC]

I don't think thats going to be an issue since he clearly stated he is using PPPoE, and then again some devices support Half Bridge mode, which can put the public IP on the router and the "modem" does not do nat that way, etc.

Even thought a double nat will work most of the time, its not the preferred way to setup a connection - since there will be a performance hit, and somethings just do not like a double nat - you can run into weird issues.

If at all possible you should only run a single nat.