| Port No | 138 |
| Service Name | netbios-dgm |
| RFC Doc | 0 |
| Protocol | UDP |
| Description | NETBIOS Datagram Service. A principle rqmt for NetBIOS services on MS hosts (Win9x/ME/NT/Win2000). UDP 137 is used for browsing, directory replication, logon sequence, netlogon, pass-thru validation, printing support, trusts, and WinNT Secure Channel. Security Concerns: Key target in auth & DOS attacks. Block at all perimeters; NIC-filter on public-exposed MS hosts |
| Reference Link | Port Information |
| Attack | No |
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