Netbios over OSPF

Unanswered Question
Apr 20th, 2009
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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"?



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hsw_networking Mon, 04/20/2009 - 06:38
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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.

Sentia NOC Mon, 04/20/2009 - 06:49
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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.


hsw_networking Mon, 04/20/2009 - 07:15
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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)


Collin Clark Mon, 04/20/2009 - 07:16
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  • Purple, 4500 points or more

Also look at forwarding UDP.

<font size="2"></p><p>ROUTER(config)#ip forward-protocol udp ?</p><p>  <0-65535>      Port number</p><p>  biff           Biff (mail notification, comsat, 512)</p><p>  bootpc         Bootstrap Protocol (BOOTP) client (68)</p><p>  bootps         Bootstrap Protocol (BOOTP) server (67)</p><p>  discard        Discard (9)</p><p>  dnsix          DNSIX security protocol auditing (195)</p><p>  domain         Domain Name Service (DNS, 53)</p><p>  echo           Echo (7)</p><p>  isakmp         Internet Security Association and Key Management Protocol (500)</p><p>  mobile-ip      Mobile IP registration (434)</p><p>  nameserver     IEN116 name service (obsolete, 42)</p><p>  netbios-dgm    NetBios datagram service (138)</p><p>  netbios-ns     NetBios name service (137)</p><p>  netbios-ss     NetBios session service (139)</p><p>  non500-isakmp  Internet Security Association and Key Management Protocol (4500)</p><p>  ntp            Network Time Protocol (123)</p><p>  pim-auto-rp    PIM Auto-RP (496)</p><p>  rip            Routing Information Protocol (router, in.routed, 520)</p><p>  snmp           Simple Network Management Protocol (161)</p><p>  snmptrap       SNMP Traps (162)</p><p>  sunrpc         Sun Remote Procedure Call (111)</p><p>  syslog         System Logger (514)</p><p>  tacacs         TAC Access Control System (49)</p><p>  talk           Talk (517)</p><p>  tftp           Trivial File Transfer Protocol (69)</p><p>  time           Time (37)</p><p>  who            Who service (rwho, 513)</p><p>  xdmcp          X Display Manager Control Protocol (177)</p><p>  <cr></p><p></font>


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