We recently attempted an upgrade from 8.2.3 to 8.4.3 and one of the issues we experienced was an issue with traceroute through the firewall. Instead of the normal traceroute output, each hop is the same IP. But the traceroute completes successfully.
Seems like this bug: CSCtj50797 but this bug is supposed to be fixed in 8.4.1 and above. Anybody have a similar experience?