Re: How does your firewall handle DNS messages > 512 octets?

[ArkanoiD <ark () eltex net>]

nuqneH,

Well, mine does cache/proxy so there is no packet size restriction 
per se..

On Tue, Aug 29, 2006 at 03:13:34PM -0400, Dave Piscitello wrote:
> Hi all,
>
> I am trying to understand how different firewalls behave when they 
> receive a UDP datagram containing a DNS message that uses EDNS0 (RFC 
> 2671) to support message sizes greater than the 512 maximum specified in 
> RFC 1035 (original DNS).
>
> Specifically,
>
> - does your firewall block/silently discard such messages by default?
> - do you know the command to allow the message if blocked by default?
>
> I've found dozens of claims that firewalls don't handle EDNS0 correctly, 
> but after a long search, I've only found URLs indicating that Firewall-1 
> and Pix block by default and have workarounds.
>
> I'm curious whether SonicWall, Netscreen, Symantec, etc. behave 
> similarly. I'd also be curious to learn the behavior of IPS devices and 
> DNS proxies (Watchguard, WinProxy, etc).


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