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Question about ip helper (relay) for DHCP

Posted: 21 May 2016 18:40
by bdillard
Hello,

I have a 6450 stack attached to a 6860. I have a Windows DHCP server with two scopes for two subnets. I'm not sure if the issue with the 6860, the 6450 or both. I've included a diagram and link to the post under the 6860. viewtopic.php?f=410&t=26128
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Re: Question about ip helper (relay) for DHCP

Posted: 22 May 2016 07:08
by silvio
Hi,
I have understand that your sonicwall is default GW for both networks (vlan 10 and 30). Also your server has interfaces in both networks.
Have you activated vlan-tagging at the server and at the switch to the server? I think no (and hope also "no" because this is not a good solution). So the server is in the untagged vlan at the 6860-port. If this is vlan 10 than the server should have an ip interface only in this vlan. OR in the other vlan. And than your routing device (sonicwall?) has to be the ip-helper (dhcp-relay). There you have to say the correct explicit address of the server.
regards
Silvio

Re: Question about ip helper (relay) for DHCP

Posted: 23 May 2016 20:35
by bdillard
Thanks - I took the 2nd iP off the server nic as I was able to get it working in an Avaya network without the second IP.

You are correct the SonicWALL is the default gateway for all subnets.

the port the server is connected to on the 6860 is vlan 10 default, vlan 30 802.1q

I still need to know what is the full command for dhcp relay and I need to know if I need to add it to both the 6860 and the 6450 please.

I appreciate all the spoon feeding you have time for today.