[ih] bufferbloat and modern congestion control (was 4004)

[Brian E Carpenter]

On 06-Oct-24 05:03, Greg Skinner via Internet-history wrote:
> On Oct 3, 2024, at 9:02 AM, Greg Skinner via Internet-history <internet-history at elists.isoc.org <mailto:internet-history at elists.isoc.org>> wrote:
>>
>> Forwarded for Barbara
...
>> How is network coding coming along these days?

I don't believe it has seen much deployment. A colleague of mine has worked on its applicability to mitigating problems with satellite-based connectivity for remote Pacific islands. [3]

> Any serious attempts to reinstitute ICMP source quench would have to go through the IETF RFC process again because it’s been deprecated for some time. [1]  Also, many sites block ICMP outright (even though they’ve been warned not to do this). [2]

The main operational problem this causes is that it breaks path MTU discovery, which damages performance. Applies to ICMPv6 too, of course. However, ICMP is viewed as a security threat, including as a DOS vector, so blocking it in firewalls is pretty common. There are recommendations in [4] and [5] for ICMPv6.

    Brian

> 
> --gregbo
> 
> [1] https://datatracker.ietf.org/doc/rfc6633/
> [2] https://www.linkedin.com/pulse/icmp-dilemma-why-blocking-makes-you-networking-noob-ronald-bartels-ikvnf

[3] U. Speidel, "Improving goodput on shared satellite links with coded tunnels," 2021 IEEE Global Communications Conference (GLOBECOM), Madrid, Spain, 2021, pp. 1-6, doi: 10.1109/GLOBECOM46510.2021.9686021.

[4] https://www.rfc-editor.org/info/rfc4890

[5] https://www.rfc-editor.org/info/rfc9099