eptyc1's comments

On: How to build a IP geolocation database from scratch?

[eptyc1]

Indeed. Openwrt for some reason defaults to reply to pings. I see the value of ICMP for servers, but I don't see the value for home ISP routers.

I disabled ICMP reply on my home router.

[sambazi → eptyc1]

> Openwrt for some reason defaults to reply to pings.

it's a bit like greeting-back ppl on the street.

not doing it will not make you invisible. it will break somebody's assumption of decency, but most ppl don't care either way.

[sgjohnson → eptyc1]

> I disabled ICMP reply on my home router.

Doesn't actually help at all because the BGP announced prefix of your IP can still be tracerouted. You won't be physically far from it.

Say if your ISP announces 125.15.18.0/17 and you're in 125.15.29.145, a traceroute will still yield a pretty good approximation of where you're at. The last hop ping is really quite immaterial here.