PeterNeff
asked on
NSLOOKUP with IP filter enabled
What port number is NSLOOKUP on NT4 using?
I have enabled the IP security and enabled Port 53 (DNS) for UDP. But any NSLOOKUP is timing out. When I enable all UDP Ports, the request is done (of course).
Which UDP Port has I to enable too?
I have enabled the IP security and enabled Port 53 (DNS) for UDP. But any NSLOOKUP is timing out. When I enable all UDP Ports, the request is done (of course).
Which UDP Port has I to enable too?
Either TCP and UDP all use port 53 as its DNS port, certainly NSLOOKUP uses this port.
ASKER
I've written, I have enabled Port 53. But NSLOOKUP (and also PING and TRACERT) use another port to call the DNS Server.
On the Server where the DNS is running, Port 53 is fine. but not on the Computer which is calling the DNS Server.
On the Server where the DNS is running, Port 53 is fine. but not on the Computer which is calling the DNS Server.
Which port NSLOOKUP uses to call DNS server?
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ASKER
I enabled now UDP Ports 1024 - 1030 and now, the DNS Request is made.
How can I controll, which Ports are dynamicly allocated?
What is the rule of the port-allocation?
How can I controll, which Ports are dynamicly allocated?
What is the rule of the port-allocation?
there is no way to control port dynamicaly assigned to client.
the range of 1024-1030 is not large enough. the range is valid from 1024 to 65535 depending on open connections and sessions.
the rule for assignement is to get next unused port above 1024.
so normaly you will get a port less then 2000. some implementations are using next port above 1024 and highest used port until 65535 is reached. so you have much higher numbers.
NT is using 1. implementation. so you can limit to 2000 mostly.
the range of 1024-1030 is not large enough. the range is valid from 1024 to 65535 depending on open connections and sessions.
the rule for assignement is to get next unused port above 1024.
so normaly you will get a port less then 2000. some implementations are using next port above 1024 and highest used port until 65535 is reached. so you have much higher numbers.
NT is using 1. implementation. so you can limit to 2000 mostly.