North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: UDP packet/DNS server
On Sun, 27 Sep 1998, Matthew Petach wrote: > > > > Hello Nanog, > > > > I am trying get zone trasfer from a host, but it seems that because of > > firewals?, I can not get any record. > > They acknowelged that there is a host behind the firewalls but they claim > > it should not affect it. (I don't believe it.) > > But I don't know how to check/prove that if certain host can > > receive/send an UDP packet. > > Zone transfers are handled via TCP, not UDP. See if you > can telnet to port 51 on their nameserver; if you can't > get a connection established, you won't be able to do > a zone transfer. > I think you mean port 53. This is both TCP and UDP. I thought DNS used both TCP and UDP. Thus firewall that is blocking UDP traffic will cause zone updates to fail. name 42/udp nameserver whois 43/tcp nicname # usually to sri-nic domain 53/tcp domain 53/udp Cheers > > TIA, > > Tatsuya > > Matt >
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