WhyNotHugo's questions

I've the following setup:

client(s)  <---> (eth0) router (eth1) <---> wan

I have a static IPv4 address and a /48 IPv6 address block. I need to connect all the clients to (wan). Each client will have it's own public IPv6. Meanwhile, I need to NAT those same clients over to (wan).

Everything IPv4-related and the NAT are working fine. The IPv6 communication to/from (eth0)<->(clients)> works fine, as does the IPv6 communication from (eth1)<->(wan) works fine.

To provide IPv6 to all my clients, I've thought of too choices:

• Having the router as a gateway, which different IP on each interface. This sounds like I need to tell my ISP to route the entire block through that single IP, so it's not really an option.

• Transparently pass IPv6 packets to/from eth0<->eth1, so all clients can communicate with the upstream gateway (I would actually have a switch here if it weren't for the need to remain IPv4 compatible).

So, since I've opted for the second choice, I'm in doubt: How can I pass all IPv6 traffic from eth0 to eth1 transparently? What I need is a level 3 bridge, but linux's bridgeutils create a level 2 bridge (which would bridge ipv4 as well, and I can't have that).

This is a DD-WRT device, but it's pretty much an embeded linux, so most suggestions that would work on linux are welcome.

Thanks.

I'm trying to configure a linux server as a gateway/router, but I can't get it to work, and all information I've managed to find is NAT-related.

I have a public IP block for the gateway and devices behind it, so I want the gateway to simply route packets to the internet - again: no NATing!

I've managed to get the gateway to access the internet successfully (that was just a matter of configuring the IP and GW), and the computers behind it can communicate with it.

[EDIT: more info]

This is actually an IPv6 block (2800:40:403::0/48) (but I've found that most utilities and instructions can be easily adapted from IPv4 to IPv6 with little hastle).

The server has too ports:

• wan: 2800:40:403::1/48
• lan: 2800:40:403::3/48

One of the computers behind it is connected to it via a switch;

• 2800:40:403::7/48

The wan interface on the server can ping6 www.google.com without issues. The lan interface on the server and the client can mutually ping each other without issues (as well as SSH, etc).

I've tried setting the server as a default gateway for the client, with no luck:

client # route -A inet6 add default gw 2800:40:403::3 dev eth1

server # cat /proc/sys/net/ipv6/conf/all/forwarding 
1

I don't want any filtering/firewalling/etc, just plain routing.

Thanks.