Firewall settings - incomplete TCP/UDP sessions

Firewall settings - incomplete TCP/UDP sessions

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Subject Author Date
Firewall settings - incomplete TCP/UDP sessions Bondi (Class-1) 01-24-2007
Posted by Bondi (Class-1) on January 24, 2007, 3:49 am
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Hello,

I've had increasing problems with my h/w firewall over the past weeks
due to 'syn flood to host (outbound)' problems.
Turns out my modded version of firefox triggers the f/w to hysterically
shut down the connection (flood control).
(I still don't know why this has only recently become a problem, as
I've made NO h/w or s/w changes, and have no viruses/spyware.)

I've basically tried to desensitise the f/w by adjusting:
'Maximum incomplete TCP/UDP sessions number from same host', (which was
originally 10) to 50 (max). This seems to work for the moment.

I don't want to set this too high, leaving my network vulnerable to dos
attacks, but I also don't want my surfing restricted by my own
firewall(!)
What is the correct (permissible) maximum value I should have this set
to?


Posted by Sebastian Gottschalk on January 24, 2007, 4:00 am
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Bondi (Class-1) wrote:

> I've basically tried to desensitise the f/w by adjusting:
> 'Maximum incomplete TCP/UDP sessions number from same host', (which was
> originally 10) to 50 (max). This seems to work for the moment.
>
> I don't want to set this too high, leaving my network vulnerable to dos
> attacks,

Huh? Now that's technical nonsense. I really fail to see any such DoS
condition due to allowing as many connections as you want and need, and
neither do I have any technical reference that anyone ever mentioned such a
scenario.

And in fact you'd rather DoS yourself with a too low setting.

> What is the correct (permissible) maximum value I should have this set
> to?

16777215 (2**24-1), the maximum.

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