Hi all,

I have a linux box with redhat 9.0 as my home router/gateway with 2 network cards installed (lan, internet). I installed firewall jay (rpm distribution). Now, consolle is filled with messages like:

ipt_unclean: TCP reserved bits non zero

NET: 1 messages suppressed

What does it mean ?!?

Second question: how can I "hardware" reset a network card? The probleam is that "lan" card every 4-6 days hangs (I thick too traffic: 50-60 Gb every 3 days).


Thanks in advance, virgus.

This is educated guesswork, rather than a definitive answer, but here goes:

The "TCP_reserved bits non zero" means that certain bits which are in a reserved field in a TCP header have something in them. This probably means a sloppy implementation of TCP somewhere, but it's possible somebody is deliberating doing things with those bits to try and hack something. For more detail on the message (including things like how to shut it up if you discover it isn't important) you probably should check the website for "firewall jay". I haven't heard of it before, so I can't be much help with the details of it.

The closest I can think of to a real power-off reset would be to stop the card, unload the module that is the driver for your ethernet card and then bring the card back up (which will automatically reload the driver).

If the problem is in the actual hardware, that probably won't help.

You might just want to get another card. They're fairly cheap, and it shouldn't stop working regardless of how heavy the traffic is. (Although you might want to check the heat conditions inside your box.)