Networks

What about show mac-address-table

First, mac-address-table also have a time to live, after that time the entry will be removed from the list
Second, Unfortunately not all cisco routers IOSs support this command (even some new IOSs do not)
Thanks

In your initial question, you kind of wanted to ping machines, so I figured you're only after what machines are currently on the network.

I'd suggest you try to ping the ip subnet you're after from your own computer, then go and read the MAC or ARP table (your choice depending on TTL etc.) There would be a chance that your activity will update the entries.
Maybe there's some smart command to ask all hosts on a physical network to chime in, to update some routing tables. But, since I don't have any Cisco routers to play with, I can't help you much more in that direction.

Oh, do you, by chance, have access to any DHCP database?
Hm. Talking about DHCP, if you can shorten the lease time on DHCP to be less than the routing cache time, then you should always have fresh data for DHCP clients available on the routing caches :)

Telnetting two hops to reach the mentioned Cisco router, so my pc in a different subnet, routing is disabled (on purpose)between my pc subnet and target subnet, so I cant run any Ip scanners from my pc.
DHCP is not an option in my case.
Asking the SysAdmin to do an IP scan on a machine within that subnet is valid, I used to ask him, but I thought there may be a way I can do myself.
There is another reply to this question, pinging the broadcast address.. but not accurate..
:)

Is it possible to ping (or quickly send one small udp packet from the intermediate host you telnet to? (i.e. do you have any useful rights on the first telnet destination?)

EditAdd: Worst case - you could have a script that would try to initiate telnet-sessions from your "second hop", as a way to refresh ARP data. (But then you'd probably need to set a longer TTL for ARP...)

i2_k5 sent me a private message:
"Hi, I tried to reply but it gives me "You have reached your maximum message level" message !!?"

When you've reached the max nesting level, the trick is to reply on the message one level above.

:) It is a ncie brainstorming session(s)..
I enjoyed it, even though it seems "pinging a range on Cisco router" is not available yet...

It is a ncie brainstorming session(s)..
I enjoyed it, even though it seems "pinging a range on Cisco router" is not available yet...