From 192.168.4.251: icmp_seq=2 Redirect Host(New nexthop: 192.168.4.1)Source
You are seeing ICMP Redirects. Directly from Cisco, ICMP Redirects happen when:
You can disable ICMP redirects by going under interface config mode and issuing- The interface on which the packet comes into the router is the same interface on which the packet gets routed out.
- The subnet or network of the source IP address is on the same subnet or network of the next-hop IP address of the routed packet.
- The datagram is not source-routed .
- The kernel is configured to send redirects.
no ip redirects
and you won't see that anymore.
"Redirect Host" messages