Connect 2 Draytek 2830n routers on different networks to 1 Cisco Powered BT Leased Line

Hello Experts

I have 2 companies sharing one big building.  They have completely separate servers, switches and routers.  The only thing they share is a comms cabinet.  They have their own internet connections provided by 1 x 15MB ADSL2+ line via a Draytek 2830n router each.

Company 1 -
Company 2 -

Last week, company 1 installed a 60 MB on 100 MB Leased Line via British Telecom.  They have now decided to share the connection but require the networks to stay completely separate.

Today i setup company 1's Draytek 2830n router via the ethernet WAN2 port (PPoE) to connect directly to the Cisco router via port FE/01.  This has worked perfectly and they are happy.  Unfortunately BT will not enable FE/02 so i can not connect the second company's Draytek 2830n to the Cisco and as a result, they are still on the ADSL2+ connection.

The question i am asking is can i connect both routers to one port (FE/01) on the Cisco Router?

There is a default gateway on the Cisco of 'say' and we have 8 available WAN IP Addresses from to 137.  Company 1 is using

Can i simply install a switch and plug both routers into it and the Cisco and configure Company 2's Draytek 2830n with

Any help on this will be greatly appreciated


Andrew BarringtonAsked:
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Craig BeckCommented:
Yes you can.  For info, the reason BT won't enable the second port on the router is because they would have to assign a new IP range to the interface.

As you suspected already, you'll need a switch between the Cisco router and the two Draytek routers.  That's it.

Check your IP addresses though.  It's unlikely that you'll have 8 WAN addresses.  You'll probably have 5 or 13.  The network you have been assigned is by the sound of it - that gives from 130 - 134 as usable addresses.  If your subnet mask is it's a /29.  If the mask is it's a /28 - that would give you addresses from 130 to 142.

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