:: Re: [DNG] IPv6 slow on one of my Li…
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Author: Michael S. Keller
To: dng
Subject: Re: [DNG] IPv6 slow on one of my Linux hosts
I did not have the opportunity to use the onboard NIC for this
point-to-point test, but with the USB network adapter, I saw no
slowdowns on a point-to-point link, while I did when it was connected to
my greater home network.

I saw no sign in syslog of an address conflict.

On 11/8/23 15:50, jeremy ardley via Dng wrote:
> On 9/11/23 05:37, Michael S. Keller via Dng wrote:
>> On 11/8/23 14:51, jeremy ardley via Dng wrote:
>>> On 9/11/23 03:56, Michael S. Keller via Dng wrote:
>>>> My oldest Linux host has trouble with IPv6. Apparently it's the only
>>>> host in my home network that does have trouble with it (of those
>>>> that can do IPv6), and I've run out of ideas. All tests are in the
>>>> same network - traffic does not cross into my ISP's area. The same
>>>> symptom has persisted across two different switch/router combos -
>>>> first an old Airport Extreme, now a TP-Link Deco XE75.
>> >Try setting up a direct cable connection between the two devices
>> >without a switch. That will eliminate the possibility of other
>> devices >on the LAN causing the problem.
>> What sort of interference are you positing, that would affect just
>> this one host, and only with IPv6?
>> _______________________________________________
> There are several possibilities, but by just running a cable between
> devices you can isolate the problem to the specific host/O/S components.
> Example of interference from other systems could be QOS shaping, IPv6
> address conflicts, hardware faults, security software. etc etc.
> If the single cable shows the same faults you can then examine things
> like MTU, /etc./sysctl.conf, net.ipv6.tcp_rmem, |net.ipv6.tcp_wmem, |and
> look for differences from other systems without the problem.
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