On 8/30/2019 10:45 PM, Charlie Gibbs wrote: > My laptop (a Lenovo T410 running Stretch) has suddenly lost the ability > to access the Internet. > > cjg@cjglap2:~$ ping pop.surfnaked.ca > PING pop.surfnaked.ca (216.113.192.36) 56(84) bytes of data. > > --- pop.surfnaked.ca ping statistics --- > 3 packets transmitted, 0 received, 100% packet loss, time 2037ms > > I don't know whether this is coincidence, but it started happening when > I got my laptop home from a trip where I accessed several foreign wifi > hotspots. The Ethernet interface doesn't work at home anymore either, > although I can still access my LAN by either Ethernet or wifi. > > I was wondering whether my routing table got borked: > > cjg@cjglap2:~$ sudo route > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use > Iface > default gateway 0.0.0.0 UG 0 0 0 > wlp3s0 > default gateway 0.0.0.0 UG 0 0 0 > enp0s25 > link-local 0.0.0.0 255.255.0.0 U 1000 0 0 > wlp3s0 > 192.168.0.0 0.0.0.0 255.255.255.0 U 100 0 0 > enp0s25 > 192.168.0.0 0.0.0.0 255.255.255.0 U 600 0 0 > wlp3s0 > > What's that word "gateway" doing in the "Gateway" column? Why doesn't > it show my router's IP address (192.168.0.1) like my desktop machine > does? (Or the "ip route" command, for that matter.) > > cjg@cjglap2:~$ ip route > default via 192.168.0.1 dev wlp3s0 > default via 192.168.0.1 dev enp0s25 > 169.254.0.0/16 dev wlp3s0 scope link metric 1000 > 192.168.0.0/24 dev enp0s25 proto kernel scope link src 192.168.0.36 > metric 100 > 192.168.0.0/24 dev wlp3s0 proto kernel scope link src 192.168.0.38 > metric 600 > > The router is accessible, just not in the routing table: > > cjg@cjglap2:~$ ping 192.168.0.1 > PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. > 64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=1.02 ms > 64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.466 ms > 64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=1.01 ms > > --- 192.168.0.1 ping statistics --- > 3 packets transmitted, 3 received, 0% packet loss, time 2033ms > rtt min/avg/max/mdev = 0.466/0.835/1.021/0.262 ms > > If I try to access the name "gateway", it looks up an IPv6 address, > although I'm set up for IPv4: > > cjg@cjglap2:~$ ping gateway > PING gateway(gateway (fe80::1278:5bff:fec8:34d0%enp0s25)) 56 data bytes > 64 bytes from gateway (fe80::1278:5bff:fec8:34d0%enp0s25): icmp_seq=1 > ttl=64 time=1.09 ms > 64 bytes from gateway (fe80::1278:5bff:fec8:34d0%enp0s25): icmp_seq=2 > ttl=64 time=1.15 ms > 64 bytes from gateway (fe80::1278:5bff:fec8:34d0%enp0s25): icmp_seq=3 > ttl=64 time=1.09 ms > > --- gateway ping statistics --- > 3 packets transmitted, 3 received, 0% packet loss, time 2002ms > rtt min/avg/max/mdev = 1.095/1.114/1.151/0.026 ms > > What has happened to my routing and how can I restore it? >
For now, do test with only one interface enabled (cable or wifi). If you are using DHCP I would try to renew the lease: $ dhclient -r <INT-NAME> && dhclient <INT-NAME> Where '<INT-NAME' is the name of your enabled interface and is optional. Note that you may have to do the above command multiple times. -- John Doe
