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New Member

Netbios over OSPF

Hi all,

I have two routers running OSPF, and wish to run my 1980's Netbios across OSPF to the LAN's in both ends.

Is it possible at all, I know I have to forward UDP 137-139, but what about the broadcasts? Can they be "forwarded"?



New Member

Re: Netbios over OSPF

Hi Philip,

Can you explain a little more what it is you're trying to do? I'm afraid your question doesn't make any sense! :-)

OSPF is a routing protocol - i.e. it is a method for routers to dynamically build their routing tables.

It wouldn't have anything to do with what you are trying to run over your network.

New Member

Re: Netbios over OSPF

Hi again,

I have two LAN, one at each downlink on a Cisco 1841. The two 1841 run OSPF between them. On the two LAN the respective user equipment wish to run netbios in order to communicate.

Netbios uses broadcast, which isn't routed beyond LAN - hence it doesn't arrives at the other LAN.

So - I'm looking for a way to "forward" these broadcasts.


New Member

Re: Netbios over OSPF

Basically I want to get Netbios broadcasts between 192.168.2/24 and 192.168.1/24.

See attached pdf.

New Member

Re: Netbios over OSPF

Is this just for your users to access network shares on pre 2000 Servers?

If so just install WINS, then add the WINS server to your DHCP server settings (Or add manually to each PC's TCP/IP settings if yo don't run DHCP)


Super Bronze

Re: Netbios over OSPF

"True" NetBIOS or NetBIOS over IP?

New Member

Re: Netbios over OSPF

"True" but with the broadcasts from Netbios forwarded - if possible.

Re: Netbios over OSPF

Re: Netbios over OSPF

Also look at forwarding UDP.

ROUTER(config)#ip forward-protocol udp ?

<0-65535> Port number

biff Biff (mail notification, comsat, 512)

bootpc Bootstrap Protocol (BOOTP) client (68)

bootps Bootstrap Protocol (BOOTP) server (67)

discard Discard (9)

dnsix DNSIX security protocol auditing (195)

domain Domain Name Service (DNS, 53)

echo Echo (7)

isakmp Internet Security Association and Key Management Protocol (500)

mobile-ip Mobile IP registration (434)

nameserver IEN116 name service (obsolete, 42)

netbios-dgm NetBios datagram service (138)

netbios-ns NetBios name service (137)

netbios-ss NetBios session service (139)

non500-isakmp Internet Security Association and Key Management Protocol (4500)

ntp Network Time Protocol (123)

pim-auto-rp PIM Auto-RP (496)

rip Routing Information Protocol (router, in.routed, 520)

snmp Simple Network Management Protocol (161)

snmptrap SNMP Traps (162)

sunrpc Sun Remote Procedure Call (111)

syslog System Logger (514)

tacacs TAC Access Control System (49)

talk Talk (517)

tftp Trivial File Transfer Protocol (69)

time Time (37)

who Who service (rwho, 513)

xdmcp X Display Manager Control Protocol (177)

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