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Vigor DNS proxy response bug?



 
 
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Old September 1st 04, 11:39 PM posted to comp.security.firewalls,uk.telecom.broadband
Ianice Berg
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Posts: 1
Default Vigor DNS proxy response bug?

x-posting: comp.security.firewalls, uk.telecom.broadband

Ianice Berg writes:
I think I have discovered the cause of many subtle headaches for Vigor
owners.

Please give feedback.

Bug?
----

The DNS proxy responses from my Vigor2600 (annex A, 2.5.5_UK)
sometimes carry the source address of the external server instead of
the routers local address.

This seems to be always true for domains with very large DNS
responses. I'd hazard a guess this is 'cos Vigor doesn't bother to
cache them and passes them straight thru.

Symptoms
--------

This will cause many clients, including secondary firewalls such as
ZoneAlarm, and programs such as nslookup to block or ignore the DNS
response.

One such domain is "include.ebaystatic.com" - How many Vigor owners
are trying to hit the ebay web site and wondering what's gone wrong
when they install ZoneAlarm?

Scope
-----

Would other people with Vigors like to see if this is true for their
models?

E.g. on most platforms you could try...

nslookup
server 192.169.0.1 // put your routers local IP addr here
include.ebaystatic.com // any domain with large DNS record


It will time out if the Vigor isnt fixing up the response address.

Workaround
----------

Set your client's (TCP/IP properties) to use external DNS servers
(they can still get their IP from the Vigor using DHCP if they want
to).

( The primary and secondary DNS server addresses listed on your
Vigor's "Online Status" web page should do for this purpose. )

ho hum.


p.s. I find Ethereal is good tool for seeing what is going on (from
Windows platform anyway).
--
Ianice Berg

 




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