[squid-users] Transparent Proxy stops working after time

[E Roberts]

I have come across a strange problem, after what could be days, hours or 
even 10 minutes my transparent proxy will just stop working.  I have tried 
to restart squid, flush and reset my firewall rules, restart NoCatAuth, 
and in the end the only thing that will get this working again is a full 
reboot.

The setup I'm using is this:

Slackware linux
kernel 2.4.20
Squid 2.5.STABLE4
iptables v1.2.8
My firewall rules seam to be unchanged when this takes effect, here is the 
part for the transparent proxy:

Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination
REDIRECT   tcp  --  192.168.0.0/16       <ip removed>       MARK match 0x4 
tcp dpt:http redir ports 8080
REDIRECT   tcp  --  192.168.0.0/16       anywhere           MARK match 0x3 
tcp dpt:http redir ports 8080
REDIRECT   tcp  --  192.168.0.0/16       anywhere           MARK match 0x2 
tcp dpt:http redir ports 8080
REDIRECT   tcp  --  192.168.0.0/16       anywhere           MARK match 0x1 
tcp dpt:http redir ports 8080
ACCEPT     all  --  10.0.0.0/8           anywhere
ACCEPT     all  --  1.0.0.0/8            anywhere
NoCat_Capture  all  --  anywhere             anywhere
DROP       tcp  -- !localhost            anywhere           tcp dpt:8080

What is strange is that the sibling proxys are still able to use this as 
their parent, and if you connect to port 8080 directly it will work (of 
course this is with out the above DROP being in the rules).

I figure this might be an IPtables issue but hope to see if anyone has had 
this issue or could point me in the correct location.

Regards