System Administration Guide: Network Services

Common Network Problems That Affect PPP

You can use the messages that are generated by netstat -s to fix the network problems that are shown in the following table. For related procedural information, refer to How to Diagnose Network Problems.

Table 21–2 Common Network Problems That Affect PPP


Message	Problem	Solution
`IP packets not forwardable`	The local host is missing a route.	Add the missing route to the local host's routing tables.
`ICMP input destination unreachable`	The local host is missing a route.	Add the missing route to the local host's routing tables.
`ICMP time exceeded`	Two routers are forwarding the same destination address to each other, causing the packet to bounce back and forth until the time-to-live (TTL) value is exceeded.	Use `traceroute` to find the source of the routing loop, and then contact the administrator of the router in error. For information about `traceroute`, refer to the traceroute(1M) man page.
`IP packets not forwardable`	The local host is missing a route.	Add the missing route to the local host's routing table.
`ICMP input destination unreachable`	The local host is missing a route.	Add the missing route to the local host's routing tables.