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2012-09-04 01:09 PM
2013-07-02 11:21 AM
mchipser wrote: I am trying to configure my stack of GS752TXS to use one DHCP server across 3 VLANs. I don't see an option to add a DHCP helper address. I read on a review a user was also unable to find this but used a workaround by trunking the port with the DHCP server. I tried this but my DHCP server still did not provide addresses to items outside of the PVID. I then contacted Netgear support and they said I needed to trunk it to a PVID not on a VLAN like 99. This did not work either. Anyone know how to work around this?
2015-09-08 11:36 AM
I have a number of VLANs on our GS752TXS stack configured, some on core (switch routed) networks and some on individual firewalled networks. From what I could tell, there is no built in DHCP relaying or serving functionality in the GS752TXS firmware. I ended up trunking each VLAN that we run DHCP on to a Linux server running dhcrelay, to forward the DHCP requests to the dhcpd server. The basic idea is:
- All VLANs are trunked to a CentOS Linux relay server, each VLAN then has a virtual interface on the relay host, including switch-routed VLANs which the stack is the gateway for
- dhcrelay is set to listen to each virtual interface and forward requests to the actual central DHCP server
- DHCP server has subnet definitions (distinguished between each other by IP range) for each subnet
You could also skip the relay host and give the DHCP server virtual interfaces on each VLAN as well. Either way be mindful of any security implications, esp. if you are mixing othewise isolated subnets, and construct your firewall rules appropriately. Overall the setup works great, although dhcrelay (from CentOS 6 distribution) has crashed a couple times in the past 1.5 years or so.