Christopher R. Hertel
crh at NTS.Umn.EDU
Tue Sep 29 16:59:51 GMT 1998
I've been poking around a bit and have a few questions.
Port 42: It appears as though this is being used for WINS replication.
Any truth to the rumor?
name 42/tcp Host Name Server
name 42/udp Host Name Server
nameserver 42/tcp Host Name Server
nameserver 42/udp Host Name Server
Port 135: This is listed as a DCE/RPC termination port. Is this being
used by the NT DCE/RPC stuff at all?
epmap 135/tcp DCE endpoint resolution
epmap 135/udp DCE endpoint resolution
# Joe Pato <pato at apollo.hp.com>
Ports 137, These are assigned for both tcp & udp. It appears, however,
138, that they are not used that way. In nmbd.c:open_sockets(),
& 139: both the NetBIOS Name Server port and the Datagram port are
opened as SOCK_DGRAM. RFC1002 talks about using both udp
and tcp for name resolution. Is this done?
The RFC says (in section 18.104.22.168) that the truncation flag
"Set if this message was truncated because the
datagram carrying it would be greater than
576 bytes in length. Use TCP to get the
information from the NetBIOS Name Server."
Going through the latest port assigments at
I notice several of entries by Microsoft. I don't know how many of these
are new. Comments?
Oh, BTW... In nameserv.h it is written:
#define MAX_DGRAM_SIZE (576) /* tcp/ip datagram limit is 576 bytes */
Shouldn't we say "udp/ip"?
Christopher R. Hertel -)----- University of Minnesota
crh at nts.umn.edu Networking and Telecommunications Services
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