I’ve had an issue where there every 100 seconds or so, I was seeing something similar to this showing in my ISC dhcp server logs:
Mar 16 23:50:06 dnsbox dhcpd: DHCPINFORM from 10.0.0.20 via eth0
Mar 16 23:50:06 dnsbox dhcpd: DHCPACK to 10.0.0.20 (00:19:d1:9f:aa:e6) via eth0
This was for every windows client on the network, luckily I’ve only got two or three at any given time 🙂
It took me a while to figure out, but it seems it’s actually Windows doing its automatic proxy auto-discovery (WPAD). If the DHCP server doesn’t respond with a “valid” response, it just keeps asking.
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