I am trying to connect a Cisco 1720 running IOS 12.1 to our isp. This is just a test to see if I can get internet connectivity before I move onto the more difficult tasks.
It has two interfaces
Ethernet0 (WIC 0)
The configuration originally had NAT enabled, but I took that out to try to isolate the problem.
The configuration I'm using is:
no ip name-server
interface FastEthernet 0
ip address 192.168.1.1 255.255.255.0
interface Ethernet 0
ip address 220.127.116.11 255.255.255.192
! Access Control List 1
! IP Static Routes
ip route 0.0.0.0 0.0.0.0 Ethernet 0
The problem is I can't ping anything on the outside network (interface Ethernet0).
The problem is seen with
show ip traffic
where it reports many encasulation failed packets.
This is happening because when I try to ping an ip address outside the network of 192.168.1.0/24 and ARP request is sent out for the destination ip. No response ever comes back so the packet encapsulation failes.
I don't know how to fix this and can't seem to find any information on this.
The WAN connection from the router is ethernet to a radio then to an ISP. I'm assuming that since it is an ethernet connection there needs to be some way of resolving an IP to a MAC address.
I would imagine the way it should work is that I need to point ethernet 0 to a gateway for which I must know the mac address or it can get it. The gateway I believe is 18.104.22.168
Thanx for the advice. I made the change you suggested but it still didn't fix my problem. This morning first thing I called the ISP and found out the problem. The radio that the router plugs into caches only one MAC address for a device that connects to it. That MAC address won't change unless you reset the radio by powering off and on again.
Once I did that everything worked like a charm. The problem was that it had the IP addressed cached witht he MAC address of the previouse device that was plugged into it. So when I'd plug that device back in the connection worked fine. When I plugged in the new Cisco router everything stopped and arp requests were not being returned because they were being returned to the wrong MAC address.
It was not a problem resolving the MAC address on the outgoing direction, it was a problem resolving the MAC address returning to my IP.
Is there a protocol command for discovering a device's ARP cache?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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