i had this problem on 2 diffrent routers a long while ago
Dlink routers that had malware that didn't get wiped with update or flash
symtoms of those dlink routers are inbound network attack detected by security software
and also a lot of network redirect
even if the router hasn't been patched...
long story short i have a lot of symptoms that my dsl router is hacked and mitm attack is in progress
how to check for firmware modification ?
tried every resetting procedure and clean install of windows multiple times
the hack seem to be in router and surviving the update / flash
dsl -n10 c1