dns replies differ in src IP from query's dst IP (Bug?)

Guy Pazi guypazi at netvision.net.il
Thu Nov 22 07:14:15 UTC 2001


Hi Alex,

Is it considered bad configuration? 
Do you know how common is out there?

Thanks 
Guy

> -----Original Message-----
> From: am134452 at ms-egmp02-01b.UK.Sun.COM 
> [mailto:am134452 at ms-egmp02-01b.UK.Sun.COM]On Behalf Of Alex Madden
> Sent: Wednesday, 21 November, 2001 4:12 PM
> To: guypazi at netvision.net.il
> Subject: RE: dns replies differ in src IP from query's dst IP (Bug?)
> 
> 
> What happens is that the DNS server has more than one IP address, and is
> running the nameserver on a secondary IP address. It recieves the query
> on the secondary IP, and replies through its primary IP.
> 
> In extreme cases (with multihomed hosts for instance) you can even see a
> reply from a different address space.
> 
> Regards,
> 
> Alex
> 
> --
> Alex Madden - Remote Administration Centre Engineer - SunUK
> Phone - (01252)423490 / x23490
> E-mail - alex.madden at sun.com
> 
> 
> 
> 


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