[dns-operations] Does anybody have a good list of capture filters for DNS traffic - details in email

Brett brettcarr at gmail.com
Wed Jul 2 14:17:08 UTC 2014


Not a direct solution to your problem but you may find this useful:


It has helped me out a few times in the past.

Thanks Shane :)


On 2 July 2014 14:56, Stefan <netfortius at gmail.com> wrote:

> Hello, DNS gurus,
> Does anybody have a good set of tcpdump/tshark capture filters, associated
> with DNS, already prep-ed for specific fields in the payload (so beyond
> just the simplistic udp 53 or tcp 53)?
> Why am I asking?
> - I need to set up traffic captures in various tiers of
> servers-hosting-applications whose owners cannot tell where the inter-tiers
> reachability depends (and maybe fails) on FWD or REVERSE lookups. This
> cannot be done by asking the server or apps folks to use the DNS
> traditional tools (dig, nslookup, host, etc.) simply because they cannot
> tell which hostnames or IPs make up the functionality of very complex apps,
> and have dependency on name resolution (direct or reverse) in order to work
> - I would be mostly interested (of course) in DNS packets with no responses
> - I would like to avoid re-inventing the wheel by trying to figure out at
> which byte offset I would have to start reading a string (is it even
> possible to identify that, knowing that certain strings are variable in
> length??), and identify no response, if someone has already figured out
> such things ;-)
> Thanks in advance for directions or "no way - forget about it"
> ***Stefan
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