mick crane wrote: > On 2019-04-09 07:46, Peter Wiersig wrote: > > mick crane <mick.cr...@gmail.com> writes: > > > > > > the PCs are physically adjacent connected with the RJ45 ( isn't it ) > > > cables through what is supposed to be a switch I got in B&Q several > > > years ago. > > > i > how do I tell if it's a switch or a hub ? > I thought a switch sends data over the required port but a hub sends over > all the ports ?
That is correct. > It's got "8 port switch" printed on it but if there is network activity all > the lights seem to flash. > > /sbin/ifconfig > enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet 10.0.0.3 netmask 255.255.255.0 broadcast 10.0.0.255 > inet6 fe80::219:d1ff:fe41:c769 prefixlen 64 scopeid 0x20<link> > ether 00:19:d1:41:c7:69 txqueuelen 1000 (Ethernet) > RX packets 47732498 bytes 13998322190 (13.0 GiB) > RX errors 0 dropped 5642 overruns 0 frame 0 > TX packets 73403188 bytes 102853469866 (95.7 GiB) > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 > device interrupt 21 memory 0xdffe0000-e0000000 You see the RX dropped 5642? That's bad. There's a chance that it's a bad ethernet cable; otherwise the hub/switch is faulty. Given that it's labelled "switch" but all the ports flash on every packet, it might well be that. Unmanaged gigabit switches are cheap; I recommend that you replace it if swapping cables doesn't solve the issue. -dsr-