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Community Member

IP Helper on SG 200-26

I am having issues with PXE getting a DHCP through this switch.   It seems I need to set the IP Helper address in the switch but I am not sure where to set this any help would be great?

I am getting the following error:

PXE-E51: No DHCP or proxyDHCP offers were received

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1 ACCEPTED SOLUTION

Accepted Solutions
Community Member

Re: IP Helper on SG 200-26

Hi Jared,

First of all. To enabled DHCP Relay (IP Helper) your VLAN needs to have an IP Address ((default)) gateway) assigned. To assign an IP Address to a VLAN your switch needs to be in L3 mode. I asume you have already done that, unless you use another device for it. But if not, please put your swith in L3 mode first.

If your switch is in L3 mode you do the following to enabled DHCP relay.

  • Go to IP Configuration > DHCP Relay > Properties
  • Enabled DHCP Relay
  • Add your DHCP Server (please make sure it is reachable/routable)
  • Go to IP Configuration > DHCP Relay > DHCP Relay Interfaces
  • Add an interface

Now you have configured DHCP Relay which is the same as IP Helper. It can occur that PXE does not work correctly. That all depends on your PXE deployment product. If you use WDS or SCCM you might need to configure some DHCP Scope Options on your DHCP Server as well. I use the following...

WDS (Windows Deployment Services):

Option 066 - TFTP Boot Server Host Name | value "WDSSERVER.yourdomain.local"

Option 067 - Bootfile Name | value "boot\x86\wdsnbp.com"

SCCM (System Center Configuration Manager):

Option 066 - TFT Boot Server Host Name | value "SCCMSERVER.yourdomain.local"

Option 067 - Bootfile Name | value "SMSBoot\x86\wdsnbp.com"

I hope this information helps you out. Good luck with your PXE deployment.

P.S: Please mark this reply as "Correct Answer" if this is the right solution for you.

2 REPLIES
Community Member

Re: IP Helper on SG 200-26

Hi Jared,

First of all. To enabled DHCP Relay (IP Helper) your VLAN needs to have an IP Address ((default)) gateway) assigned. To assign an IP Address to a VLAN your switch needs to be in L3 mode. I asume you have already done that, unless you use another device for it. But if not, please put your swith in L3 mode first.

If your switch is in L3 mode you do the following to enabled DHCP relay.

  • Go to IP Configuration > DHCP Relay > Properties
  • Enabled DHCP Relay
  • Add your DHCP Server (please make sure it is reachable/routable)
  • Go to IP Configuration > DHCP Relay > DHCP Relay Interfaces
  • Add an interface

Now you have configured DHCP Relay which is the same as IP Helper. It can occur that PXE does not work correctly. That all depends on your PXE deployment product. If you use WDS or SCCM you might need to configure some DHCP Scope Options on your DHCP Server as well. I use the following...

WDS (Windows Deployment Services):

Option 066 - TFTP Boot Server Host Name | value "WDSSERVER.yourdomain.local"

Option 067 - Bootfile Name | value "boot\x86\wdsnbp.com"

SCCM (System Center Configuration Manager):

Option 066 - TFT Boot Server Host Name | value "SCCMSERVER.yourdomain.local"

Option 067 - Bootfile Name | value "SMSBoot\x86\wdsnbp.com"

I hope this information helps you out. Good luck with your PXE deployment.

P.S: Please mark this reply as "Correct Answer" if this is the right solution for you.

Community Member

IP Helper on SG 200-26

My SG200-26P doesn't do L3.  Its a "Layer 2" switch.

How to get DHCP traffic thru ?

TIA's

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