wireshark capture filter port destination

#Wireshark capture filter port destination windows

TCP: NBNS can also use TCP as its transport protocol for some operations, although this might never be done in practice.

The well known UDP port for NBNS traffic is 137. UDP: Typically, NBNS uses UDP as its transport protocol. See the NetBIOS page for the history of NetBIOS. WINS (Windows Internet Name Service) uses the same protocol, but unicast messages to a WINS-Server, multiple WINS servers can replicate the content with the WINS-Replication protocol.

#Wireshark capture filter port destination windows

NBNS is still widely used especially on Windows networks, as there might still be older versions of Windows on those networks, or it might not yet have been converted to use only DNS. Therefore, newer Windows systems, starting with Windows 2000, can use DNS for all the purposes for which NBNS was used. With the advent of SMB-over-TCP, it is no longer necessary to have a machine's NetBIOS name in order for that machine to make connections to SMB servers or in order for SMB connections to be made to that machine, and with the advent of 'dynamic DNS', a host can register its name and its IP address or addresses with a DNS server when it boots (note that its IP address might not be static - it might be granted by a DHCP server - so you can't necessarily statically register a machine's host name and IP address with a DNS server). IP, IPX, …), other implementations of the NetBIOS services have their own mechanisms for translating NetBIOS names to addresses.) NBNS's services are more limited, in that NetBIOS names exist in a flat name space, rather than DNS's hierarchical one (multiple flat name spaces can exist, by using NetBIOS scopes, but those are rarely used), and NBNS can only supply IPv4 addresses NBNS doesn't support IPv6. (As NetBIOS can run on top of several different network protocols (e.g. NBNS serves much the same purpose as DNS does: translate human-readable names to IP addresses (e.g. The NetBIOS Name Service is part of the NetBIOS-over-TCP protocol suite, see the NetBIOS page for further information. This service is often called WINS on Windows systems.