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Re: putty go slow




On 2019-04-09 07:46, Peter Wiersig wrote:
mick crane <mick.crane@xxxxxxxxx> 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.

Almost, RJ-45 is the specification for the plug and jacks, what you're
having here is ethernet wiring in twisted pairs between client and
server connected by a hub.  Or switch, please clarify that as that
changes a lot.

Is anything else connected to this hub?  If your problems occur, is
anything else using the hub concurrently?  Can you reduce the
connections only to server and client and maybe a internet uplink?
Network printers can do unimaginably bad things in regard to hubs, and
even switches.

Can you change the hub to a real switch?

but I think it might be a hub.
Perhaps that is the culprit ?

Perhaps. Check the "ifconfig" output on the Linux side, maybe reset the
server, connect from windows and if you're having problems check the
dmesg output regarding the interface.

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 ? 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

I've got a Buster PC with apache2, cups, dovecot, roundcube as mail and print server. a Buster PC I mess about on, a win 10 PC and a printer all connected to the "switch" the gateway is a PC with pfsense on it which is connected to "switch" and its other network card connected to ISP router thing.

Maybe the sluggishness I sometimes observed is Windows updating itself ?

mick


For reference, here's my output:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet 217.172.177.159 netmask 255.255.255.0 broadcast 217.172.177.255
        ether 00:19:66:f1:43:9e  txqueuelen 1000  (Ethernet)
        RX packets 81994186  bytes 14753508445 (13.7 GiB)
        RX errors 14  dropped 0  overruns 14  frame 0
        TX packets 107524155  bytes 14836289080 (13.8 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


Take note of the 2nd line of RX and TX status lines, there should be no
counters there, in my case 14 overruns in regard to 819 million packets
is a very low error rate.  I suspect that if there's a network problem
it would manifest in some higher relative values on your side.

If in doubt verify that both sides are set to auto-negotiate and replace
both wires from the machines to the hub with new cables.

Peter

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