I ran into an issue with DHCP on DNSmsaq 2.85. It's running on a host with two IP addresses on the same network. The primary IP is .12 and the secondary is .10. DNSmasq was put in place to replace a missing server (long story), so it was setup to listen on the missing server's IP of .10.
The DHCP Relay device was sending requests to DNSmasq at .10, but DNSmasq was replying to the request using the .12 IP address, which the DHCP relay device promptly ignored. I tried fixing the problem using various combinations of "interface=" and "bind-interface", but the reply was always being sent using the primary IP (.12). I finally reversed the primary and secondary IP addresses and the problem is fixed. However, is there a proper way to fix this? Or, is this a bug/limitation? Config file and tcpdump capture below. Thanks, Brad 15:18:22.216760 IP 172.28.141.1.bootps > 172.28.8.10.bootps: BOOTP/DHCP, Request from xx:xx:xx:xx:xx:xx (oui Unknown), length 266 15:18:23.578420 IP 172.28.141.1.bootps > 172.28.8.10.bootps: BOOTP/DHCP, Request from xx:xx:xx:xx:xx:xx (oui Unknown), length 266 15:18:25.310501 IP 172.28.8.12.bootps > 172.28.141.1.bootps: BOOTP/DHCP, Reply, length 300 15:18:25.311037 IP 172.28.8.12.bootps > 172.28.141.1.bootps: BOOTP/DHCP, Reply, length 300 15:18:26.137923 IP 172.28.141.1.bootps > 172.28.8.10.bootps: BOOTP/DHCP, Request from xx:xx:xx:xx:xx:xx (oui Unknown), length 308 15:18:29.142546 IP 172.28.8.12.bootps > 172.28.141.1.bootps: BOOTP/DHCP, Reply, length 300 15:18:29.155150 IP 172.28.141.1.bootps > 172.28.8.10.bootps: BOOTP/DHCP, Request from xx:xx:xx:xx:xx:xx (oui Unknown), length 266 15:18:29.155816 IP 172.28.8.12.bootps > 172.28.141.1.bootps: BOOTP/DHCP, Reply, length 300 15:18:35.169175 IP 172.28.141.1.bootps > 172.28.8.10.bootps: BOOTP/DHCP, Request from xx:xx:xx:xx:xx:xx (oui Unknown), length 266 15:18:35.169933 IP 172.28.8.12.bootps > 172.28.141.1.bootps: BOOTP/DHCP, Reply, length 300 listen-address=127.0.0.1,172.28.8.10 #auto-expand simple queries, ones with no domain expand-hosts interface=eth0:1,lo bind-interfaces domain=myhouse.net server=172.28.10.205 dhcp-range=set:tag0,172.28.8.100,172.28.8.200,255.255.255.0,168h dhcp-option=tag:tag0,option:router,172.28.8.1 dhcp-option=tag:tag0,6,172.28.8.172.28..1.10.205 dhcp-range=set:tag1,172.28.16.100,172.28.16.200,255.255.255.0,168h dhcp-option=tag:tag1,option:router,172.28.16.1 dhcp-option=tag:tag1,6,172.28.8.172.28..1.10.205 dhcp-range=set:tag2,172.28.140.100,172.28.140.200,255.255.255.0,1h dhcp-option=tag:tag2,option:router,172.28.140.1 dhcp-option=tag:tag2,6,8.8.8.8,8.8.4.4 dhcp-range=set:tag3,172.28.141.100,172.28.141.200,255.255.255.0,1h dhcp-option=tag:tag3,option:router,172.28.141.1 dhcp-option=tag:tag3,6,8.8.8.8,8.8.4.4
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