I have a Linksys WRT1200AC using LEDE Reboot 17.01.2 r3435-65eec8bd5f / LuCI lede-17.01 branch (git-17.152.82987-7f6fc16)
I have made 4 WAN ports using VLANS (WAN, LAN1, LAN2, LAN3) and only 1 LAN port(LAN4). Everything is working fine when router is online but when I restart router, if I'm using LAN1 or LAN2 or LAN3 port as WAN port PC connected to LAN4 is assigned IP address from WAN DHCP server. If I disconnect LAN4 cable and then I connect it back, the IP address is assigned by the router correctly.
Only happens when restarting router and using LAN1 or LAN2 or LAN3 as WAN port.
Doesn't happen when using WAN port as WAN port.
It seems to me like when restarting there is some time when traffic goes directly to LAN ports without filtering DHCP packets.
Does any one have an idea on how to fix this problem?