Accessing Draytek Vigor 120 in bridge mode

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art3011

39 posts

Geek

#57953 2-Mar-2010 11:47

I have a Draytek 120 configured as modem only bridged mode connected to a Linksys WRT54GL router running tomato. I can connect to the Linksys router web interface using 192.168.1.1. Is there a way to connect to the Draytek web interface without unplugging it from the router and plugging it directly to my compter. I configured the Draytek to have an address of 192.168.2.1, but I don't know how to connect to the to web interface while still attached to the Linksys router.

billgates

4705 posts

Uber Geek

Trusted

#303614 2-Mar-2010 12:08

same setup.

here is what i have to access the modem

modem - 10.0.0.1
router - 192.168.1.1

then in tomato under administration, scripts, firewall, add this line

sleep 5
ip addr add 10.0.0.10/24 dev vlan1 brd +

/usr/sbin/iptables -I POSTROUTING -t nat -o vlan1 -d 10.0.0.0/24 -j MASQUERADE

OR

just add this line and see if it works

/usr/sbin/iptables -I POSTROUTING -t nat -o vlan1 -d 192.168.0.0/24 -j MASQUERADE

make sure you reboot the router afterwards.

Do whatever you want to do man.

art3011

39 posts

Geek

#303640 2-Mar-2010 12:59

Thanks billgates.

I tried adding on firewall script page as you said:
/usr/sbin/iptables -I POSTROUTING -t nat -o vlan1 -d 192.168.0.0/24 -j MASQUERADE

However it did not work when reboot. There is even no response when I ping 192.168.2.1. Can you tell me exactly how I should put the script on my firewall page. My addresses:

modem = 192.168.2.1
router = 192.168.1.1

In your situation, I don't understand why you used 10.0.0.10/24 on your ip addr add command when your modem address is 10.0.0.1 (and not 10.0.0.10). Sorry, I'm not an expert on networking and using ip and iptables commands.

Thanks

billgates

4705 posts

Uber Geek

Trusted

#303649 2-Mar-2010 13:12

Try this.

under Init tab in admin/scripts page

add this line

sleep 5
ip addr add 192.168.2.1/24 dev vlan1 brd +

and under firewall tab

add this line

/usr/sbin/iptables -I POSTROUTING -t nat -o vlan1 -d 192.168.2.0/24 -j MASQUERADE

reboot and try accessing again.

draytek's do full bridge mode where my set up is half bridge mode with a different modem but the script above hopefully will work.

Do whatever you want to do man.

art3011

39 posts

Geek

#303728 2-Mar-2010 16:54

Thanks again billgates.

I tried the commands above on the init and firewall tab. But when I try 192.168.2.1, it goes to my router and not my modem. So 192.168.2.1 = 192.168.1.1.

billgates

4705 posts

Uber Geek

Trusted

#303758 2-Mar-2010 18:55

Try this..

under Init

sleep 5
ip addr add 192.168.2.2/24 dev vlan1 brd +

and under firewall

/usr/sbin/iptables -I POSTROUTING -t nat -o vlan1 -d 192.168.2.0/24 -j MASQUERADE

reboot and see

if it does not works then edit instead of 192.168.2.0/24 make it 192.168.2.1/24 for the firewall script above

Do whatever you want to do man.

art3011

39 posts

Geek

#303764 2-Mar-2010 19:24

Thanks, 192.168.2.2 works. Now I can access the modem with 192.168.2.1. Just my curiosity, why is there a need for a 'sleep 5' on top of the init script. Is there some quirk in tomato ?

billgates

4705 posts

Uber Geek

Trusted

#303766 2-Mar-2010 19:27

The startup script actually runs ahead of some services. Things that involve networking, for example, are not going to be up yet when the startup script begins. To work around this, use "sleep 5" or a similar command to wait until what you need is up and running.

Do whatever you want to do man.

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mentalinc

3240 posts

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#565642 7-Jan-2012 08:15

As part of my digging up old threads as I replace my RTA 1320 with first the TP-Link 8840T (which Doesn't work in IP forwarding). The above steps only work on Tomato for dd-wrt the following wiki page provides the required steps:
http://www.dd-wrt.com/wiki/index.php/Access_To_Modem_Configuration

So using the example above where the modem = 192.168.2.1

Startup:
ifconfig `nvram get wan_ifname`:0 192.168.2.2 netmask 255.255.255.0

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

Working a treat in Firefox anyway. IE9 seems to get all confused and stop working...
Browsing is nice and quick with firefox though so easy to check the settings and sync etc. I'd still suggest directly connecting to the computer when doing firmware updates just to be safe....

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