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Does anybody know how I might begin to troubleshoot this? You know, the usual stuff from the sysadmin kitbag Use your console access to check your logs and take appropriate action. check you have correctly configured network interfaces check your firewall. check that sshd is running check your change/config management system for other recent stuff ...


Most probably the pong from ping is blocked/gets discarded, while traceroute uses an error message form a node/hop to determine the route. Traceroute is not a standard tool, in that it uses a trick to get the information. The trick is to manipulate the TTL, so the hop responds with an ICMP error (ICMP TTL exceeded), and that is why this is possible.

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