Customer with dual FE Cisco, with 192.168.18.0/24 on one side, 18.104.22.168/24 on the other, also bridge configured as they have IPX/SPX.They have a DHCP server on the .19 network, assigning addresses from a .18 scope which is maxed out. They want something sharpish to get over this problem, are aware L3 in the campus would be best etc.The .17 network is unused.If they put a .17 secondary to the .18 interface and configure a helper address to the .19 based DHCP server, I recall there being an issue around the fact that the router primary address is used as the ingress port in the DHCP request, so you don't get access to the new scope - is there a workaround on this? Any other issues to be aware of?
Depending on the actual equipment used, it may be possible to implement vlans: configure dot1q encapsulation on one FE of the router (with two subinterfaces, each with the same helper-address), connect it to a dot1q port on a switch, implement 2 vlans on the switch, one for 18 and one for 17 (or more, if you want to make the broadcast domains smaller)
If that's not possible, you might consider defining static mac-to-ip mappings on the dhcp server but that would really be a PITA to maintain.
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