On Sat, 20 Jun 2020 17:22:02 +0100, Terry Coles wrote: > On Saturday, 20 June 2020 15:21:40 BST Terry Coles wrote: > > What's the minimum needed to get something up on the Internet that > > would respond to a query of some kind? I've looked at various > > Tutorials and they all seem to be a fair bit of work. I have > > another Pi which could be used in place of the one running the > > two servers, so is there something quick and dirty just to do > > this test? > > I just tried traceroute to see if the Home Router could be reached. > It does look as if using my phone's hotspot could be the problem > because although traceroute 8.8.8.8 completed in 14 hops after ~68 > ms, traceroute <my WAN Address> never completed after 64 hops. > There was a lot of stuff happening between hops 11 and 17 with > multiple IP Addresses being listed, but no sign of my Router's > address. > > Have I interpreted this correctly? It would appear to me that the > packets never arrive for some reason.
That's a good idea. (Running traceroute.) I would interpret that result to mean that the network knows a route to the Home Router, but beyond a certain point along the route, no response packets are returned, for whatever reason. Probably the Home Router is ignoring the packets, but the same result would occur if a router along the way was blocking either the requests or the responses. Or, it could mean that there are more than 64 hops between the laptop connected to the hotspot and your Home Router, but that seems pretty unlikely. I just tried pinging my own home router over a mobile network. $ traceroute <my WAN address> doesn't complete after 64 hops, but $ traceroute -I <my WAN address> completes after 18 hops. The -I option is to 'Use ICMP ECHO as probe.' In both cases, the same set of IP addresses is listed for the earlier hops (i.e. the same route is used). When I configure the router to not respond to pings, the traceroute never completes, regardless of whether -I is used. Patrick -- Next meeting: Online, Jitsi, Tuesday, 2020-07-07 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
