1841 pass through

[rkovelman]

I have another 1841 that I am using for vlans and having the vlans talk to one another but more importantly I need the router to pass all packets through where they need to go.  Is this possible?  Normally I set the restrictions up on the firewall and the firewall passes them off to whatever IP its intended to go to.  For instance if someone from the outside tries to make a PPTP connection, the firewall sees the activity and knows where to pass these packets to.  I will be placing the 1841 in between the firewall and the server handling these PPTP requests.  But moreover I do not want the 1841 to block anything to its intended route.  How can I achieve this with out messing up the vlans or do I need to place all these access requests into the 1841?

[Jon Marshall]

rkovelman wrote:
Oh yea woops, got myself confused. 
You said to assign relevent ports but what if you have an Avaya phone for instance with an extra port on the back of it for a computer. So now over the same wire to the switch its passing both the computer and the VOIP? That port on the switch then becomes or does 2 vlans.  Or maybe what I want is not possible?  Have a switch and router know what vlan to put something on by what it is passing through it?

See this thread for how to configure the ports if you have Avaya phones -

https://supportforums.cisco.com/message/316893#316893

Jon

[rkovelman]

Thanks for the link.

Just for my further clarification:

If you have 2 vlans and each has its own IP range the router allows the 2 vlans to talk together.  So in essence if I have the 2 seperated now phone and computer network I could in theory keep it that way but stick the router in between and just make sure the vlans on the switches are both not on vlan 1 as they are by default.

I really want to be able to though plug a computer into the back of the phone and get the right IP and see the network.  Is this possible?  I am not running Cisco Switches but that link helps point in the right direction.

[Jon Marshall]

If you have 2 vlans and each has its own IP range the router allows the 2 vlans to talk together.  So in essence if I have the 2 seperated now phone and computer network I could in theory keep it that way but stick the router in between and just make sure the vlans on the switches are both not on vlan 1 as they are by default.

Not sure what you mean by this. it's nothing to do with vlan 1. If you have 2 vlans and you connect them to the router with subinterfaces those vlans will be able to communicate with each other. If you don't want them communicating with each other then use access-lists on the subinterfaces.

I really want to be able to though plug a computer into the back of the phone and get the right IP and see the network.  Is this possible?  I am not running Cisco Switches but that link helps point in the right direction.

Can't say for sure if non-Cisco switches but don't see why not. If the DHCP server is on a different vlan than the computer is meant to be in you would need to add this under the subinterface on the router for the computer vlan -

int fa0/0.10

ip helper-address x.x.x.x  <--- where x.x.x.x is the DHCP server address

Jon