We operate a transparent web-cache which uses ICMP redirects to divert clients to the cache. With kernel 3.7.1 (witnessed in installation systems for openSUSE 12.3 and Ubuntu 13.04), ICMP redirects appear to be ignored. Same behaviour seen in 3.8.6. See also https://bugzilla.novell.com/show_bug.cgi?id=814510 Please let me know which kind of diagnostics you require.