Ping from different interfaces of a router.

[Maxpeigne]

Hello guys!

I'm still doing my first steps with steps in the cisco's world (and the networking world in general).

Using packet tracer, I have a router with 2 subnets ("spare"). I'm also experimenting with the ARP cache of another router "R2". Both routers are in the same subnets.

When I ping "R2" from "spare" and then I check the ARP table, I notifce that the ping always comes from the same IP of spare (I never see the ARP entry to the address 10.10.20.3 in the table).

My question: How can I send a ping from the other port of spare?

[Flavio Miranda]

@Maxpeigne 

You need to ping 10.10.20.2 from spare. Based on the destination, the Router will place the packet accordingly. 

If you ping 10.10.10.x , It will always used the interface on the same network range. 

[Martin L]

Pining remote networks router will chose best outgoing interface based on FIB which based on Rounting table. This "out" interface IP will be ur source IP and will be used by returing device as destination IP. 

Extended Ping command is not supported in PT (ping source x destination y or ping <press Enter >to fill in info)

However, PT lets u create advanced packet format to test various protocols; Chose on "custom packet" icon on top menu to create ICMP and choose your IPs. 

Regards, ML
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