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11-28-2012 10:52 AM
11-28-2012 10:52 AM
I have a 5412 running 15.08.0013 software.
i have 4 vlans. this is the core routing switch. i have configured ip helper on 3 vlans because the dhcp server is in the fourth vlan and doesn't need any help.
i have set the primary vlan to vlan 200, not left it at vlan 1.
when a user connects to a port in vlan 200 they get an ip address that belongs to vlan 201. If i disable the scope for vlan 201 they get an ip address for vlan 202. If i disable the 3 scopes, they get an address for vlan 200.
Could this be related to setting the primary vlan to 200?
thanks,
Solved! Go to Solution.
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11-28-2012 10:55 AM
11-28-2012 10:55 AM
Re: Problem with ip helper
Paste some relevant conf. What is a "primary vlan"?
CCIE Service Provider
MASE Network Infrastructure [2011]
H3CSE
CCNP R&S
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11-28-2012 11:13 AM
11-28-2012 11:13 AM
Re: Problem with ip helper
primary vlan is a config that takes some of the function off the default vlan.
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11-28-2012 12:48 PM
11-28-2012 12:48 PM
Re: Problem with ip helper
Set "dhcp-relay option 82 replace ip" on your switch. (Unless it's already set and you removed it from the config; it would be better if you uploaded your entire switch config.)
Paul
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11-28-2012 01:29 PM
11-28-2012 01:29 PM
Solutionalso, what DHCP server are you running and how is it configured? I've seen some Windows DHCP servers configured with "supernet" that gave out IPs from wrong scopes when using ip-helper.
CCIE Service Provider
MASE Network Infrastructure [2011]
H3CSE
CCNP R&S
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11-29-2012 11:16 AM - edited 11-29-2012 11:27 AM
11-29-2012 11:16 AM - edited 11-29-2012 11:27 AM
Re: Problem with ip helper
You were right, the scopes were all added under a super scopes option on the dhcp server.
thanks.
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