Over the past few weeks an issue has come into my network. I am unable to find the root cause. We force all clients to use our DNS server…, we run DHCP and DNS on our core router… we are fully bridged and use VLANS to the client units.
Clients using DLINK brand routers with the “DNS RELAY” feature enabled are getting many page not found errors. The only way to get these errors to disappear is to turn the feature off in the router.
Has anyone else had this problem???
Andreas
what does this feature do?
please check if those relays configured properly and dhcp is set up properly on your routerboard too. Please see manual on how to do that.
i think you could point to relay from dhcp server.
edit:
dhcps relay allows you to get ip configuration from dhcp server that is not in your subnet but further away.
it probably has to do with a broken dlink recursor not allowing > 512 byte udp packets. Many DNS responses now are > 512 bytes and either need TCP or EDNS, and the dlink implementation is probably faulty. search the net for “edns” and that router model to see if there is anything about it.