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Cisco 2600 T1 Router Configuration

Posted on 2009-05-07
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Last Modified: 2012-05-06
A simple question I hope....

I am thinking of making some infrastructure changes here that will require us to modify the way the router handles IP traffic.  Specifically, we have a next hop route line in the router config that forwards traffic for any of the IP's in the subnet to x.x.x.x (our Firewall). We want the router to JUST do ARP requests for the individual IP's that it is routing traffic for instead. So, I want to confirm if I remove the HIGHLIGHTED BOLD LINE below in the config that the router would behave in this fashion, or must I make other entries in the config?

CISCO 2600 startup-config below&


> Using 1191 out of 29688 bytes
>
> !
>
> version 12.1
>
> service timestamps debug uptime
>
> service timestamps log uptime
>
> no service password-encryption
>
> !
>
> hostname zzzz
>
> !
>
> enable secret 5 $1$v3Jx$6D9F.sk/Pgpba1o2CumT3/ enable password zzzz !
>
> !
>
> !
>
> !
>
> !
>
> ip subnet-zero
>
> no ip finger
>
> ip domain-name ALTER.NET
>
> ip name-server n.n.n.n
>
> ip name-server n.n.n.n
>
> !
>
> !
>
> !
>
> !
>
> interface FastEthernet0/0
>
> description To Office Ethernet
>
> ip address n.n.n.n 255.255.255.0    
>
> no ip mroute-cache
>
> no keepalive
>
> speed 100
>
> full-duplex
>
> no cdp enable
>
> !
>
> interface Serial0/0
>
> description to UUNET (zzzzz)
>
> bandwidth 1536
>
> no ip address
>
> encapsulation frame-relay IETF
>
> no ip mroute-cache
>
> load-interval 30
>
> no fair-queue
>
> service-module t1 timeslots 1-24
>
> frame-relay lmi-type ansi
>
> !
>
> interface Serial0/0.1 point-to-point
>
> bandwidth 1536
>
> ip address 1z.z.z.z 255.255.255.252  no ip redirects  no ip
> proxy-arp  no ip mroute-cache  no arp frame-relay  no cdp enable
> frame-relay interface-dlci 500 IETF !
>
> ip classless
>
> ip route 0.0.0.0 0.0.0.0 Serial0/0.1
>
> ip route x.x.x.x 255.255.255.0 x.x.x.x no ip http server !   **** THINKING OF REMOVING THIS LINE ****  This line forwards all traffic to our FW (x.x.x.x)
>
> no cdp run
>
> !
>
> line con 0
>
> transport input none
>
> line aux 0
>
> line vty 0 4
>
> password zzzz
>
> login
>
> !
>
> no scheduler allocate
>
> end

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Question by:rdelrosario
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2 Comments
 
LVL 32

Accepted Solution

by:
harbor235 earned 500 total points
ID: 24332640


If you remove the static route then the traffic will be routed to the default nexthop out Serial0/0.1, is that what you want? Default route is used if the route is not in the routing table.

You are describing proxy arp for IPs that are local to a router interface, it will not arp out on non ethernet interfaces, like your serial interfaces, they do not use ethernet.

harbor235 ;}
0
 

Author Comment

by:rdelrosario
ID: 24353571
Harbor235,
We will be connecting a hardware loadbalancer to the ethernet port of the router.  We want the load balancer to do the proxy arps.  The load balancer is a powerlink 200 by Ecessa.
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