DHCP, Gratuitous ARP, and Proxy ARP with XP

PeterUKPeterUK Member Posts: 327  Master Member
edited June 10, 2019 3:31AM in ZyWALL VPN Series

Yes XP is dead but I use it for testing and does a odd Decline for DHCP with this setup that WIN 7 & 10 or Ubuntu are fine with but found a reg key that fixed XP so I wanted to post this to show the problem I was having.

The setup is with a ZyWALL 110 and a port based VLAN like this:

https://businessforum.zyxel.com/discussion/comment/4580/#Comment_4580

With a VLAN 18 setup with set to Interface type general:

192.168.255.49/255.255.255.240

DHCP server

IP pool start address 192.168.255.50 pool size 3

Default router vlan18 IP

Enable Proxy ARP

192.168.255.48/28

Here what happens with win 10 that works fine

Here what happens with win XP

As you can see XP fails but with this registry key

https://www.itprotoday.com/compute-engines/how-can-i-disable-gratuitous-arp

it works!

So I was wondering if anything can be done on the USG/ZyWALL that would allow clients like XP to just work? 

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