I have an Archer C7 v2 together with a cable modem and LEDE 17.01.4
The internet access works without issues over the DHCP wan connection.
I want to access the web interface of the modem on it's 192.168.100.1 IP and created a "modem" interface on the eth0 wan with an IP in the modem range (192.168.100.2) .
I've also added the "modem" interface to the WAN firewall zone.
Accessing the web interface of the modem doesn't work !
On the web interface of the modem I can see that arp seems to get lost. It shows the router IP 192.168.100.2 with INCOMPLETE status and a zero mac address.
The funny thing is that it starts to work if I change my LAN address of my router to 10.168.0.1/24 instead of 192.168.0.1/24
The arp table on the modem shows now the mac address of the router and I can access the web interface over the router. It still works for some time when I switch back my LAN address to 192.168.0.1 which could be due to caching the arp.
config interface 'lan' option type 'bridge' option ifname 'eth1' option proto 'static' option netmask '255.255.255.0' option ip6assign '60' option ipaddr '192.168.0.1' config interface 'wan' option ifname 'eth0' option proto 'dhcp' config interface 'modem' option ifname 'eth0' option proto 'static' option ipaddr '192.168.100.2' option netmask '255.255.255.0' /etc/config/firewall config zone option name 'wan' option input 'REJECT' option output 'ACCEPT' option forward 'REJECT' option masq '1' option mtu_fix '1' option network 'modem wan wan6'
How can i debug this and find the reason why the ARP response from the route to the modem gets lost ?