Why doesn traceroute work anymore with my 5660?
Traceroute simply doesn’t work with Windows. This is a well-known issue with Efficient routers and unfortunately cannot be fixed unless Efficient makes the 5660 be able to forward ICMP packets. Since it can’t, if you want to use traceroute I recommend you use Linux, since Linux traceroute uses TCP packets which the 5660 can forward. Or just put the 5660 back into bridge mode and use PPPoE software again temporarily. Please note that no firmware upgrade adds traceroute in Windows. According to Efficient, “it’s not a bug, it’s a feature!” What a crappy feature, since the 5660 responds to all ping requests. And no, you cannot stealth a 5660 without trying to mess with the IP Filtering.