WINS traffic not being forwarded

[Dominique Demore]

Hi folks,

For some reason, it seems that my WINS traffic isn't being forwarded across subnets over our 3750's. This is causing the workstations to have a "hit and miss" with authentication. I have enable "ip helper-address", "ip forward-protocol udp 137/138", even tried "ip directed-broadcast".

If I create create an LMHOST file, it works everytime. "Enable NetBIOS over TCP/IP" is enable on WinXP Clients. On Win98 clients receives it's setting from dhcp.

PCa---Vlan1 --<>-- Vlan2 ---- WINS Server / Authentication

Thanks..

-- Dominique

[Georg Pauwen]

Hello Dominique,

is the ip helper address the address of the WINS server ?

Make sure your switchports are configured with 'spanning-tree portfast', otherwise timeouts might occur.

I think the Windows 98 clients default to B-node (broadcast only), you might want to change that to H-node (query name server, than broadcast).

Can you post the configuration of your 3750 ?

Regards,

GP

[jlingerf]

You need to make sure the client is picking up the hybrid setting in the dhcp config that is being handed to it.Can u paste in a "ipconfig /all" to here? on the 3750 you should be able to troubleshoot also by configuring a dhcp pool for a vlan that looks similar to this config :

ip dhcp pool CLIENT

network 192.168.1.0 255.255.255.0

default-router 192.168.1.1

domain-name cisco.com

option 150 ip 192.168.10.10<-ip phone tftp for ccm

netbios-name-server 192.168.1.7 <----Must have

netbios-node-type h-node <----Must have

dns-server 64.81.79.2

lease 5

alse ensure you dont overlay client ips on top of serever ips with this command:

ip dhcp excluded-address 192.168.1.1 192.168.1.15

first ip is the beginning and last is the end of the excluded range. you may also want to do a debug ip packet applied with a acl matching netbios against the interface facing the server to ensure the packets are even arriving to that subnet and also ping the clients from the server. Good luck..

Jamie Lingerfelt

ex HTTS engineer

[Dominique Demore]

Hi Everyone,

This is how I have the device currently configured:

<..snip..>

ip dhcp excluded-address 10.203.8.1 10.203.8.29

!

ip dhcp pool 10.203.8.0/24

network 10.203.8.0 255.255.255.0

default-router 10.203.8.1

dns-server 10.70.0.9 10.70.0.6

domain-name rainbowschools.ca

netbios-name-server 10.203.0.7

netbios-node-type h-node

!

<..snip..>

!! Example Interface Configuration !!

interface FastEthernet1/0/23

description Academic

switchport access vlan 108

switchport mode access

no cdp enable

spanning-tree portfast

!! Server VLAN interface !!

interface Vlan100

ip address 10.203.0.1 255.255.255.0

!! Academic VLAN interface !!

interface Vlan108

ip address 10.203.8.1 255.255.255.0

ip helper-address 10.203.0.7

ip directed-broadcast

!! IP Forward Protocol !!

ip forward-protocol udp netbios-ss

ip forward-protocol udp bootps

ip forward-protocol udp bootpc

--> Even when I enter "ip forward-protocol udp 137/138", it doesn't appear. So I am assuming it is on by default.

Thanks.

-- Dominique

[Richard Burts]

I am not clear what is the cause of your issue. But yes 137 and 138 are enabled for forwarding by ip helper-address by default.

I see that you have ip directed-broadcast configured on vlan 108. I suspect that this is misplaced. If it is needed the directed-broadcast command is configured on the interface where the directed broadcast is delivered not on the interface where it is sourced.

HTH

Rick