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New Member

cisco 2621 router

My company has a cisco 2621 router with one s0 and 2 Fast Ethernet ports.

here is the scenario, one side of the network is 10.0.0.0 with subnet mask at 255.255.255.0 running an NT 4.0 server /with dhcp running and use 2 24 port hubs. On the other side, I have a network of 10.1.0.0. With a windows 2000 member server running DHCP for the 10.1.0.0. So both networks have DHCP running. 1st I want to know how to configure the router to route both networks with out having Dhcp forwarding to each others network. 2nd, once the router is configured and Eth port 2 is working, do I run eth port 2 cable from the router to The hubs on 10.0.0.0 and will it route to a gateway of 10.1.0.1 which is my internet gatway so both but different networks can use the internet on gateway 10.1.0.1.

Thank you for helping

Phillip Guthrie

  • Other Network Infrastructure Subjects
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: cisco 2621 router

If you are using 255.255.255.0 then you are ok. Router by default doesn't forward any dhcp broadcast so you are OK there-

Just config, 10.0.0.0/24 on one ethernet interface and 10.1.0..0/24 on the other ethernet interface. By default , router do routing across directly connected interface.

For the default gateway, use the static route to point to 10.1.0.1 on the router. Make sure that the network 10.0.0.0/24 uses ethernet 10.0.0.0/24 ip address as default gateway and 10.1.0.0/24 network should use second ethernet interface ip address. and it is not the good idea to connect the hub to the two network. that will kill the reason of segmenting.

2 REPLIES
Cisco Employee

Re: cisco 2621 router

If you are using 255.255.255.0 then you are ok. Router by default doesn't forward any dhcp broadcast so you are OK there-

Just config, 10.0.0.0/24 on one ethernet interface and 10.1.0..0/24 on the other ethernet interface. By default , router do routing across directly connected interface.

For the default gateway, use the static route to point to 10.1.0.1 on the router. Make sure that the network 10.0.0.0/24 uses ethernet 10.0.0.0/24 ip address as default gateway and 10.1.0.0/24 network should use second ethernet interface ip address. and it is not the good idea to connect the hub to the two network. that will kill the reason of segmenting.

New Member

Re: cisco 2621 router

I am routing across eth0/0 and eht0/1 to machines on the opposite networks.

my 10.1.0.0 network uses 10.1.0.1 as the internet gateway and this works fine. My problem is that my 10.0.0.0 network cannot get out on the internet. what must i do for the 10.0.0.0 network to allow them to use the internet on this router? Is it the static route that combines the networks together that allows it to use the default gateway? if so how do i assign this static route. If the two networks are routing why doesn't know to use the default gatway of 10.1.0.1 . I know there are two different subnets but if it routing what makes the 10.1.0.1 different from any other 10.1.0.0 address. Why does it not just use the same gateway 10.1.0.1.

Thanks for all that has been helping on this issue.

phillip

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