What is NetBIOS? Does Windows need its ports 137 and 138 open?
NetBIOS over TCP/IP is specified by RFC 1001 and RFC 1002. The Netbt.sys driver is a kernel -mode component that supports the TDI interface. Services such as workstation and server use the TDI interface directly, while traditional NetBIOS applications have their calls mapped to TDI calls through the Netbios.sys driver. Using TDI to make calls ...
How are (NetBIOS?) names being resolved on my network?
2024年4月5日 · Generally NetBIOS is tied to SMBv1 being enabled; if SMBv1 is disabled at OS level, then NetBIOS features are not used at all. This is interesting, as I have SMBv1 disabled in Windows on both machines, (appwiz.cpl > Turn Windows features on or off) , however Wireshark is definitely showing UDP traffic on port 137, marked as 'NBNS'.
Solved: netbios-ns/udp traffic - Experts Exchange
2012年4月2日 · I have noticed a lot of traffic coming from one ip address to external ip addresses on netbios-ns/udp 137. These happen every few seconds from this paticular pc. Right now i have disable netbios over tcp/ip but i want to know what is causing this.
networking - Difference between NetBIOS and SMB - Super User
3. What is the relationship between SMB and NetBIOS; are they seperate, does one rely upon the other? SMB does rely on NetBIOS for communication with devices that do not support direct hosting of SMB over TCP/IP. NetBIOS is completely independent from SMB. It is an API that SMB, and other technologies can use, so NetBIOS has no dependency to SMB.
Solved: 137/upd open|filtered netbios-ns | Experts Exchange
2017年5月26日 · Using nmap, the 10 that are found show: 137/upd open netbios-ns The 20 that are not found show: 137/upd open|filtered netbios-ns 1. I've check the firewall settings on each, the settings are the same. 2. Have imported wfw to a machine that isn't found (using wfw from a found machine) 3.
Suspicious NetBios Name Service traffic - Super User
12:52:37.567533 IP (tos 0x0, ttl 128, id 17406, offset 0, flags [none], proto UDP (17), length 78) 192.168.0.2.netbios-ns > 192.168.0.255.netbios-ns: [udp sum ok] >>> NBT UDP PACKET(137): QUERY; REQUEST; BROADCAST TrnID=0xBC60 OpCode=0 NmFlags=0x11 Rcode=0 QueryCount=1 AnswerCount=0 AuthorityCount=0 AddressRecCount=0 QuestionRecords: Name ...
NetBIOS packet probing (port 137). Does it come from the router?
2016年4月27日 · DST Port 137 (NetBIOS) packets coming from router's IP. Does the router have some weird "extras" with NetBIOS, or is it an outsider? Invalid unsolicited packets with !!??!! SRC Port=443, coming from various IP addresses, allocated to Google Inc. Can this …
Solved: Netbios-NS packet capture - Experts Exchange
2011年2月16日 · Anyway, you can try to simply disable NetBIOS on that network card / network connection (if its VPN or whatnot). Simply go to the network card / network connection, go to properties, IPv4 properties, then go to the advanced button. On the WINS tab, place a radio dot next to Disable NetBIOS over TCP/IP.
Blocking Netbios traffic at router level (Cisco)
2005年9月8日 · What I would like is an explanation of how to configure our Cisco routers to block the Netbios traffic being generated from this server but not block all Netbios traffic. To assist, here are our subnets: 192.168.1.x 192.168.2.x 192.168.3.x The server that needs to not send Netbios info to other subnets is at: 192.168.2.100 Thanks!!
Why would a Windows machine scan for port 137? - Super User
2018年3月21日 · The port 137 can be utilized by TCP or UDP. In this case, the "nbname" is used for the Name Service, name broadcasts for building browsing lists. 3 ports will be used in this case (NBT) and other ports 138, 139 have other responsibilities. NBT also depends on the DNS. SMB also depends on NetBIOS unless direct hosted.