FUBARinSFO
Premium
join:2006-03-25
Oakland, CA
| [Windows] Access bridged modem configuration behind/in front of
Folks:
OK, here we go on what appears to be a very old topic: accessing the configuration and status interface of a bridged ADSL modem that is separated from the computer by a router. (Whether it's behind or in front of the router is a matter of perspective I think):
Computer LAN NICs---Switch---Router---ADSL modem BRIDGED mode---Internet
The ADSL modem web GUI configuration interface is accessible in all cases when the computer is attached directly to the modem:
Computer NIC---ADSL modem BRIDGED mode---Internet
The most relevant of many threads I've found on this topic is this one:
»[Windows] Can I access cable modem menu through router?
In that thread, it is "Muiredised" (what kind of a handle is that?) who has described the desired solution best. Unfortunately, it hasn't worked for me, as it didn't work for any others in the thread, as near as I can tell.
I have tried his static routing solution with three different ADSL modems in bridge mode, and experimented with a number of gateway addresses as well. Details are below. It is unclear to me why a bridged modem will present (or allow) more than one ip address on a single physical port, or rather will listen for, recognize and peel off its own ip address on traffic to the internet.
The observations of OZO in that thread make the most sense to me, tho I'm hoping it's possible using static routing in the router (not the modem) that this will work. (I might also note that tubbynet's evidence of it "working" by showing the ping data is not conclusive. The ISP can have this address available on its network, which appeared to be the case for me that I discovered with tracert.)
Any clarification of this issue would be greatly appreciated.
-- Roy Zider
ADSL modems, all in bridge mode:
-------------------------------
Efficient Networks Speedstream 5100b, 1.0.0.53 firmware
ip 192.168.0.1, not changeable.
Efficient Networks Speedstream 5861, v5 firmware
ip 192.168.254.254
Broadxent Briteport 8120
primary ip 192.168.1.1
secondary ip 192.168.0.1
Router:
-------
Linksys BEFSR41 router
ip 192.168.1.2/255.255.255.0
Computer:
----------
Computer LAN NIC:
ip 192.168.1.101/255.255.255.0
Bridged ip/mask/gateway:
------------------------
69.12.241.xxx/255.255.255.0/69.12.241.1
Various static routings:
---------------
Destination ip/mask:
192.168.0.0/255.255.255.0 -- 5100b
192.168.254.0/255.255.255.0 -- 5861
192.168.1.0/255.255.255.0 -- 8120
Various gateways:
-----------------
192.168.0.1
192.168.1.1
192.168.254.254
69.12.241.1 |
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Bink
join:2006-05-14
Denver, CO
 ·Qwest.net
| Re: [Windows] Access bridged modem configuration behind/in front
I don’t know if the Linksys can do this, but I have a bridged modem in front of my OpenBSD box/firewall and can access the modem via conditional NAT on the OpenBSD box—and I feel this is the best method for doing this as it does not require any special configuration on the modem. Even though my modem is in bridged mode, it still has an IP—and I have my OpenBSD box configured in such a way that if traffic is going out to the Internet, the OpenBSD box NATs my IP out the public IP, but if traffic is destined to the private subnet between the OpenBSD box and the modem, my IP is NATted out the private IP that’s in the “modem” subnet. With this configuration, I can fully access the modem from any system on my LAN—and do not need to create a route on the modem that points back to the LAN to do so. I doubt the Linksys can do this, but you might be able to get it done with DD-WRT or similar Linksys replacement firmware.
Hope this helps/is not too confusing. If you’re interested in doing something like this, let me know and I’ll provide more detail. |
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FUBARinSFO
Premium
join:2006-03-25
Oakland, CA
| Bink:
As I mentioned, I can access the modem ip config pages when it is in bridged mode if I connect to it directly with the computer (setting the computer ip subnet to include the modem ip address). But can't do it with the Linksys in between.
So it's not generally an issue getting to the modem, it's getting the Linksys to route it to the modem.
Is there some reason you think the lInksys can't do this? The link I included indicated it could. I'm not familiar with DD-WRT replacement firmware.
-- Roy |
|
wayjac
Premium,MVM
join:2001-12-22
Indy | If one of the four port modems can be configured to be a hub/switch this faq is what you need
How do I access the modem GUI thru a router - advanced methods? |
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FUBARinSFO
Premium
join:2006-03-25
Oakland, CA
| Wayjac:
Yes, I'm familiar with that thread. It's very good, but has problems which I've already tested and encountered
1. Doesn't work for single port modems
2. Generates self-flooding of network from modem back up to router, blocking all download activity for about 60-90 seconds, every five minutes or so.
3. One or more of the methods needs another small switch between the router and the modem, requiring more equipment.
4. Doesn't solve the static ip addressing problem I'm trying to solve here.
Thanks, though.
-- Roy |
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