This topic

Packet loss on route to various places

MeaTLoTioN — Mon, 28 Jun 2021 13:23:21 GMT

Hi there,

I'm seeing a lot of packet loss on the route my connection has been given.

It appears that 31.55.186.197 is where the packet loss is happening, I'm showing about 50-60% packet loss from that hop.

Host Loss% Snt Last Avg Best Wrst StDev
1. 10.101.0.1 0.0% 42 0.3 0.4 0.2 1.2 0.2
2. 192.168.0.1 0.0% 42 1.1 1.1 0.8 2.3 0.2
3. 172.16.10.238 0.0% 42 1.8 2.3 1.5 3.4 0.5
4. 31.55.186.197 56.3% 42 5.5 5.1 4.5 5.8 0.4
5. 31.55.186.204 0.0% 42 7.1 5.6 4.6 7.5 0.6
6. core3-hu0-11-0-3.faraday.ukcore. 0.0% 42 6.0 5.8 5.0 8.4 0.6
7. peer2-et4-1-0.slough.ukcore.bt.n 0.0% 42 5.7 8.9 5.4 35.1 7.7
8. linx1.orbital.net 0.0% 42 7.0 6.6 5.5 8.5 0.7
...

31.55.186.197 belongs to BT;

$ whois 31.55.186.197
% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See http://www.ripe.net/db/support/db-terms-conditions.pdf

% Note: this output has been filtered.
% To receive output for a database update, use the "-B" flag.

% Information related to '31.55.184.0 - 31.55.187.255'

% Abuse contact for '31.55.184.0 - 31.55.187.255' is 'abuse@bt.com'

inetnum: 31.55.184.0 - 31.55.187.255
netname: BT-21CN-TMAN-V2
descr: BT-21CN-TMAN-V2
country: GB
admin-c: BR2649-RIPE
tech-c: BR2649-RIPE
status: ASSIGNED PA
remarks: Please send abuse notification to abuse@bt.net
remarks: INFRA-AW
mnt-by: BTNET-MNT
mnt-lower: BTNET-MNT
mnt-routes: BTNET-MNT
created: 2013-08-16T08:40:35Z
last-modified: 2013-08-16T08:40:35Z
source: RIPE

role: BT RAM
address: BT
address: UK
admin-c: AA12126-RIPE
tech-c: AA12126-RIPE
nic-hdl: BR2649-RIPE
mnt-by: BTNET-MNT
created: 2012-04-10T15:28:46Z
last-modified: 2012-04-10T15:28:46Z
source: RIPE # Filtered

% Information related to '31.48.0.0/13AS2856'

route: 31.48.0.0/13
descr: BT Public Internet Service
origin: AS2856
mnt-by: BTNET-INFRA-MNT
created: 2011-02-11T10:32:17Z
last-modified: 2014-07-30T09:04:12Z
source: RIPE # Filtered

I hope this helps, I'd really like to get this sorted as soon as possible.

Thanks.

Re: Packet loss on route to various places

pippincp — Mon, 28 Jun 2021 17:39:35 GMT

There is nothing to sort out. You are not suffering any packet loss.

Re: Packet loss on route to various places

Gary_C — Wed, 30 Jun 2021 09:14:54 GMT

Isn't some packet loss part and parcel of tcp/ip

Especially in the congestion control algorithm

Re: Packet loss on route to various places

pippincp — Wed, 30 Jun 2021 12:51:10 GMT

No.

Re: Packet loss on route to various places

MeaTLoTioN — Wed, 30 Jun 2021 12:56:51 GMT

Isn't this line;
4. 31.55.186.197 56.3% 42 5.5 5.1 4.5 5.8 0.4
showing 56.3% loss?

What is this if not?

Re: Packet loss on route to various places

pippincp — Wed, 30 Jun 2021 13:05:31 GMT

If those packets were lost how did the destination get them all?

All you are seeing is a router treating ICMP requests as low priority and not replying in the alloted time. The packets were still passed on to the next router.

Re: Packet loss on route to various places

Gary_C — Wed, 30 Jun 2021 16:49:01 GMT

@pippincp

I thought AMID used it to control the congestion window ?

Or more, to detect and control

Been a very long time since college so I have a lot of packet loss myself 🙂