[dns-operations] Is this valid edns0 query?

Wessels, Duane dwessels at verisign.com
Fri Oct 10 17:52:21 UTC 2014


Mohamed,

I'd say it is valid.

RFC 6891 says (section 6.1.2) that a client or server should simply ignore OPTION-CODE values
that it doesn't know about.  The request should be processed as though that funny option
code were not even there.

DW


On Oct 10, 2014, at 10:14 AM, Mohamed Lrhazi <Mohamed.Lrhazi at georgetown.edu> wrote:

> Hello,
> 
> We have an appliance generating DNS requests that our F5 DNS server is silently dropping... We are working with both vendors to try and figure out whose fault it is.... 
> 
> Could someone please tell me if this request is valid? 
> 
> User Datagram Protocol, Src Port: 18646 (18646), Dst Port: domain (53)
> Domain Name System (query)
>     Transaction ID: 0x9b89
>     Flags: 0x0100 Standard query
>     Questions: 1
>     Answer RRs: 0
>     Authority RRs: 0
>     Additional RRs: 1
>     Queries
>         compliance.georgetown.edu: type A, class IN
>             Name: compliance.georgetown.edu
>             Type: A (Host address)
>             Class: IN (0x0001)
>     Additional records
>         <Root>: type OPT
>             Name: <Root>
>             Type: OPT (EDNS0 option)
>             UDP payload size: 1280
>             Higher bits in extended RCODE: 0x0
>             EDNS0 version: 0
>             Z: 0x0
>             Data length: 31
>             Option: Unknown (20732)
>                 Option Code: Unknown (20732)
>                 Option Length: 27
>                 Option Data: 00000202000048f204656e74310d73757065726773615f6d...
> 
> 
> 
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