Routing between WAN modem and LAN router

Forums › LAN (ethernet/Wifi/routers/Bluetooth) › Routing between WAN modem and LAN router

Aaroona

3196 posts

Uber Geek

#138142 21-Dec-2013 16:39

So in anticipation for my VDSL install on Christmas Eve, I went out and bought a Vigor DV130. So far the modem syncs 2-3mbps faster and does bridge mode perfectly.

My problem however, is while using bridge mode, I have lost connectively to my modem via HTTP for administration.

so my Modem is on 192.168.1.1/255.255.255.0

My router (DD-WRT) is on 192.168.2.1/255.255.255.0

How can I assign a static route to allow me to make changes to my modems settings (or check my WAN connection speed) going via my LAN?

Ragnor

8219 posts

Uber Geek

Trusted

#956035 22-Dec-2013 02:17

Not sure about DD-WRT but in Tomato you can add commands to the init and firewall scripts via the GUI so you give the WAN interface a local ip address in the modem's range and add some iptables magic for routing

init: ip addr add 192.168.1.3/24 dev $(nvram get wan_ifname) brd +

firewall: iptables -I POSTROUTING -t nat -o $(nvram get wan_ifname) -d 192.168.1.2/24 -j MASQUERADE

Ragnor

8219 posts

Uber Geek

Trusted

#956036 22-Dec-2013 02:19

Actually here's the DD-WRT wiki page for what you want to do, looks pretty similar

http://www.dd-wrt.com/wiki/index.php/Access_To_Modem_Configuration

Aaroona

3196 posts

Uber Geek

#956083 22-Dec-2013 10:32

Thanks for you reply - I must be being daft.

I can't seem to get either instructions to work, which in all likelyhood, means I'm doing something wrong.

So, based on the commands for DDWRT, I ran:

ifconfig `nvram get wan_ifname`:0 192.168.1.2 netmask 255.255.255.0

Then:

iptables -t nat -I POSTROUTING -o `nvram get wan_ifname` -j MASQUERADE

tried to access 192.168.1.2 and it just pointed to DDWRT.
Tried 192.168.1.1, no go there either..

Aaroona

3196 posts

Uber Geek

#956089 22-Dec-2013 10:53

I have no idea why, but for some reason its just jumped back into life.

These are the commands that ended up working for me:

ifconfig `nvram get wan_ifname`:0 192.168.1.10 netmask 255.255.255.0

iptables -t nat -I POSTROUTING -o `nvram get wan_ifname` -j MASQUERADE

Which now, makes sense. I believe the vigor DV130 has a a virtual interface by default that is allocated the 192.168.1.2 address... the only reason I can think of why it didn't work.