question for people who actually know networking (Xfinity gateway behavior) boosts+ 

I have an xfinity combo router+modem. It gets a public IP no problem, and devices on the LAN get IPs via DHCP no problem, and "internet works" EXCEPT I can't connect to my own public IP address, traceroute fails completely, everything times out. Public IP is accessible from remote networks. I've been using /etc/hosts files as a local workaround but it's weird and annoying. Appreciate any suggestions!

question for people who actually know networking (Xfinity gateway behavior) boosts+ 

@ItsTheManOnTheMoon Oh god, I was running into something very similar to this last year when I was trying to set up my server on my own. I feel like I have the answer on the tip of my tongue, but I can't remember it, and I also know nothing about actual networking.

Sometimes, I've found that sketching a diagram of every step in the connection process helps me figure out what's going wrong where.

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question for people who actually know networking (Xfinity gateway behavior) boosts+ 

@ItsTheManOnTheMoon AHA. I think this is probably an issue of NAT loopback. Again, I know very little about networking, but what I've gathered is that NAT loopback is a feature that, when enabled, allows a device to access another device on the same local network as though it were coming from an external network--in other words, what you're looking for.

NAT controls should be in your router admin?

question for people who actually know networking (Xfinity gateway behavior) boosts+ 

@ItsTheManOnTheMoon Hopefully that at least sets you off on the right direction!

question for people who actually know networking (Xfinity gateway behavior) boosts+ 

@EssDub thanks for the hints! The weird thing is that I'm not exactly trying to do NAT (as I understand it) - the combination modem/router device, as far as I understand it, has two interfaces; the one used by the modem to connect to the comcast WAN (external IP address) and the one used by the router to provide the private LAN. I've got port forwarding set up for a couple of things, and it works fine /

question for people who actually know networking (Xfinity gateway behavior) boosts+ 

@EssDub ...just not from the LAN itself for some reason. In any event, there is actually no NAT option on the router config anyway, it being comcast the admin UI seems pretty well nerfed.

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