You might want to try "man nmap". It specifically states -sS is for checking TCP. There is a -sU for checking UDP.
However simpler than using nmap from within a server is using "lsof" to check activity on a given port: lsof -i :53 ________________________________ From: bind-users-boun...@lists.isc.org [mailto:bind-users-boun...@lists.isc.org] On Behalf Of Thomas Manson Sent: Thursday, May 28, 2009 9:28 AM To: bind-users@lists.isc.org Subject: BIND do not listen on udp port 53 Hi, I'm using BIND 9.5.0-P2 (on ubuntu server 8.04). And the bind server do not listen anymore on the udp port. I've updated the /etc/bind/named.conf to add a domain, but didn't touch the /etc/bind/named.conf.options. On localhost, when I use nmap I can see that the udp port is not listed. tho...@ns1:/etc/bind$ sudo nmap -sS localhost [sudo] password for thomas: Starting Nmap 4.62 ( http://nmap.org ) at 2009-05-28 15:17 CEST Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1. Interesting ports on localhost (127.0.0.1): Not shown: 1709 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 53/tcp open domain 80/tcp open http 953/tcp open rndc 9102/tcp open jetdirect Nmap done: 1 IP address (1 host up) scanned in 0.175 seconds tho...@ns1:/etc/bind$ Does anyone have an idea of what's going on ? I can't figure out why this stop working as before. Maybe it's trivial, but as it's not my fulltime job to manage these dns servers (and have so much other thing to deal with), so help would be appreciated. Regards, Thomas. Please consider our environment before printing this e-mail or attachments. ---------------------------------- CONFIDENTIALITY NOTICE: This e-mail may contain privileged or confidential information and is for the sole use of the intended recipient(s). If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you. ----------------------------------
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