Example for setting KeepAlive options in ConnectCallback on Linux

[bkindersleytrulioo]

Describe the issue or suggestion

I can see that this snippet was added in response to this issue

however, it doesn't seem to work on a linux OS. based on this comment, that's expected behaviour, and a workaround is suggested, but it would be nice if there was an actual example with that workaround

[MihaZupan]

Sounds like a duplicate of dotnet/runtime#110124

@antonfirsov dotnet/runtime#111676 would fix this such that the workaround would no longer be required, right?

[antonfirsov]

Yes, if we merge it .NET 10 will ship with the fix. On current versions unfortunately it's necessary to do the DNS resolution in the ConnectCallback.

Given .NET 8 end of support is in November 2026, I wonder if we should adjust the docs regardless?

[HighPerfDotNet]

We run suddenly today into this also for Linux builds - the fix really needs to be ported to .NET 8, it's a current LTS and .NET 10 isn't even out yet - it's not Long Term Support if fixes don't get backported to it while period of support is still valid.