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DHCP and Relays

Stu Mills

Hi,

We have recently swapped our core switches to Meraki MS250-48FP to which we have enabled the DHCP on the switch, and my gateway is XG450 (SFOS 18.0.5 MR-5-Build586)

I am tidying up the Network on the gateway, and looking for old and redundant features, I have found on the gateway there are DHCP Relays, which out of the list of seven in total only two I can see (using Logviewer and checking In and OUT interfaces) with traffic. I appreciate this may of been something from years ago (I took on the network with no documentation) My question is, are these still required if I can configure something on the Meraki?

Cheers

Stu



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    Hello Stu,

    Thank you for contacting the Sophos Community.

    They wouldn't be necessary if your Meraki devices would be doing the DHCP, however, if the DHCPs in the XG are configured as Relay, it means the XG  isn’t the DCHP server, but only passing down the requests from an upstream DHCP.

    If the devices asking for the DHCP can reach out directly to the DHCP server, then you can remove it from the XG. 

    A DHCP relay is not required for an interface where it is in the same broadcast domain as the DHCP server, as long as there is no DHCP server configured on the firewall it’ll get the request.

    Regards,

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  • 0

    Hello Stu,

    Thank you for contacting the Sophos Community.

    They wouldn't be necessary if your Meraki devices would be doing the DHCP, however, if the DHCPs in the XG are configured as Relay, it means the XG  isn’t the DCHP server, but only passing down the requests from an upstream DHCP.

    If the devices asking for the DHCP can reach out directly to the DHCP server, then you can remove it from the XG. 

    A DHCP relay is not required for an interface where it is in the same broadcast domain as the DHCP server, as long as there is no DHCP server configured on the firewall it’ll get the request.

    Regards,

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