LAN Bridging over WAN... Help?

Saiyanthou

Saiyanthou

Saiyanthou

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Joined
8 Oct 2004
Posts
95
Hi Guys,

I call upon your collective expertise in my time of need.

I'm looking to bridge 2 networks across a DSL link (WAN).

LAN A on 10.0.0.XX and LAN B on 10.0.0.XX.

Modems are talking to each other and making a link and from one modem I can ping the other, from on LAN I cannot ping the other, or the other LAN's modem.

Is what I'm looking for feasible without using a VPN or am I in the clouds?

Cheers,

J
 
its only going to work if the routers support bridging which is not likley, otherwise a packet sent from lan A that YOU want to go to lan B will NEVER get past the 1st router... as the router will know that 10.0.0.x is its local lan and there is no need to pass it on...

why not route? I assue you have two office already set up and you dont want to mess with the setup?
 
I have one modem set to 192.168.20.4 as WAN IP and gateway as 192.168.20.22. And visa versa for the other modem.

The connection is set to 1483 IP Bridged.
 
edscdk said:
its only going to work if the routers support bridging which is not likley, otherwise a packet sent from lan A that YOU want to go to lan B will NEVER get past the 1st router... as the router will know that 10.0.0.x is its local lan and there is no need to pass it on...

why not route? I assue you have two office already set up and you dont want to mess with the setup?
Click to expand...

One modem is a Zoom X5 (cheap and nasty) which supports 1483 Bridged IP + NAT. And the other is an Aware 550 Module, which is uber expensive and supports bridging via xml setup.

I have several paired devices, one at each side and need them to talk to each other, they use several protocols/ports which is why I'm trying to bridge.

More than one device uses port 80 for configuration so routing would cause issues I think.
 
hmm, are you sure you're not confusing the modem bridge that basically ports the WAN IP to the LAN side of the modem (when you want to tack your own router to the otherside of the modem)?

We've done this with Cisco kit to migrate from a datacentre (networks behind a firewall) to another DC.

You need some beefy routers then run a GRE tunnel between them, and create a BVI interface on the router and the tunnel and then there's a command to allow the L2 broadcasts down the tunnel. That'll work, but you need extra hardware to do the tunneling.
 
edscdk said:
its only going to work if the routers support bridging which is not likley, otherwise a packet sent from lan A that YOU want to go to lan B will NEVER get past the 1st router... as the router will know that 10.0.0.x is its local lan and there is no need to pass it on...

why not route? I assue you have two office already set up and you dont want to mess with the setup?
Click to expand...

I agree with this, the subnets would need to be different across site, unless they talk to each other via the non RFC1918 address of the foreign site.
 
Chief Wiggum said:
hmm, are you sure you're not confusing the modem bridge that basically ports the WAN IP to the LAN side of the modem (when you want to tack your own router to the otherside of the modem)?
Click to expand...

I might be, I'm not hugely experienced beyond plug and play LAN's. Never messed with this side before.

paradigm said:
I'm just not sure why you'd be trying to avoid using a site to site VPN?
Click to expand...

I only have hardware to do this and not sure how to do it without software.

So should I set up a routing table for the paired devices using MAC/IP's?
 
It seems that is no longer an option. Current hardware, I've been told, 'should' suffice.

But I don't think it's with the cheap modem. The information is mostly coming from the other end anyway.

I'm playing with the expensive modem/router but it's difficult as it's set up from xml files downloaded via ftp, no nice GUI to play with.

One file called co_atm_router.xml is for setting up the mode. I have available modes - Router, Bridge, ExpressBridge and PPP. I can't see anywhere in these files for forwarding any LAN information on the WAN, so I'm assuming it would need to be set-up as some sort of transparent link so that information will always be put across the whole LAN.
 
#Chri5# said:
At what point does the person telling you the existing hardware will "suffice" accept you are wasting time?
Click to expand...

When it catches fire and I'm standing with a box of matches and a bottle of paraffin.


paradigm said:
If you only have modems (not routers), and you can't use a leading edge server/software or purchase VPN routing hardware, then you might as well just give up now.
Click to expand...

They are both routers. They have DSL links and Ethernet. But yes, not extra hardware available. Is it even possible?
 
Well the Zoom X5 certainly won't allow for any advanced routing/vpn endpoint configuration.

The Aware 550 I can't even find anything about, other than it's used for DSL testing (rather than being a production device). So I'd not be wanting to use that for the purpose of live networking either.

If you are being told from above to use what's available, then you can't proceed any further IMO. You need kit designed for the task, and by that I mean commercially available VPN routers, regardless of how cheap or expensive they are.
 
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