Router With Dual LAN/VLAN

theboyrob · 9 Dec 2008 at 11:19

One of my customers is moving offices to join an office with another business. They are wanting to use the same infrastructure but want to keep the LAN's separate. They both have Windows SBS machines.

I am thinking of installing a Cisco switch whcih supports VLAN's. They currently have a Netgear router providing the broadband to the current system. Both systems want to share the same broadband connection so I am looking for a router which will support two different LAN's, either virtual or physical and would like any recommendations!

Thanks!

growse · 9 Dec 2008 at 11:23

Cisco 877 does VLANs. Are you looking to just channel the same ADSL connection to two different networks?

theboyrob · 9 Dec 2008 at 11:35

Yes, we have a Cisco 24 port switch which supports VLAN's which we are going to install, so just need to seperate the broadband connection into two seperate networks. The Netgear router is going to stay, so just need a router to stick inbetween the netgear box and the two lans

FrenchTart · 9 Dec 2008 at 11:58

.....

mike1210 · 10 Dec 2008 at 08:39

theboyrob said:
The Netgear router is going to stay, so just need a router to stick inbetween the netgear box and the two lans

To be honest I wouldn' t do it that way. If you use an 877 (you'd need the Adv IP services IOS BTW for routable VLAN's but you may get away without by doing it on the switch if the networks don't need access to each other), you would have better perimter security by ditching the Netgear altogether plus better remote access features i.e. SSL-VPN, IPSec VPN etc, better ability to limit outgoing traffic etc

Just a thought, the 877 may not be needed if you are seperating the networks on the switch but I couldn't be sure of that, they would not be routable though

when you say seperate networks do you just mean seperate broadcast domains and ACL's or totally separate as in they can't see each other at all

K.C. Leblanc · 10 Dec 2008 at 16:26

Have you looked into using an old box with something like smoothwall installed.

Also some switches will do routing between Vlans.

#Chri5# · 11 Dec 2008 at 08:45

Draytek routers will do seperate VLANs whilst sharing a single ADSL - dead simple to config - see here.

Then just create two VLANs on the Cisco switch to seperate the networks.

Liquidfox · 11 Dec 2008 at 09:05

Way we've done it before is to set one port on the switch as a trunk port, so effectively part of both VLANs, then plug the router into that. So long as the VLANs are on the same IP range, there's no problem

At least i think we did it like that

Skidilliplop · 12 Dec 2008 at 16:16

Liquidfox said:
Way we've done it before is to set one port on the switch as a trunk port, so effectively part of both VLANs, then plug the router into that. So long as the VLANs are on the same IP range, there's no problem

At least i think we did it like that

That works for internet access might not work for inter VLAN routing. But the OP hasn't specified if this is needed or not.
To route between VLans you need a router that supports 802.1q VLAN trunking protocol. You can connect one router interface to a port in each VLAN if your router has multiple Ethernet interfaces (not the case on SOHO kit) but it's much tidier to use a single interface and a trunked port.