Bug#678519: general: after about 1 month of uptime, routing of IPv6 packets is no longer possible, and IPv4 routing becomes slow and unpredictable. Rebooting brings all functionality back, and back to speed. so far the best way for me to discover is to try a ping6, and reboot the firewall (this machine), when ping6 from the inner network fails.

[Rudy Zijlstra <rudy@grumpydevil.homelinux.org>]

Package: general
Severity: important
Tags: ipv6

let system run with IPv4 & IPv6 routing for about 1 month
> IPv6 routing will start to fail
> IPv4 routing becomes slow and unpredictable

no obvious causes visible in the system. top and friends do not show a cpu hog

a reboot will bring the system back to normal behaviour. 

-- System Information:
Debian Release: 6.0.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-686 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash