On Mon, 2002-10-07 at 17:46, Matthew Palmer wrote: > On Mon, 7 Oct 2002, Howard Lowndes wrote: > > > Is a udp packet from source port 53 to dest port 53 kosher? I would have > > expected the source port to be in the high range. > > No, there's no reason for a source port to be a high number. It'll just be > another DNS server doing a query, and being tricky by using 53 over again. > Might even be considered a feature, if you've got a lot of outgoing UDP > connections - doesn't waste a port. Not a particularly pressing > consideration, however.
A few DNS setups lock DNS down to 53 outgoing to enable a simple firewall rule. KenF -- SLUG - Sydney Linux User's Group - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
