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So you think you understand IP fragmentation?

So you think you understand IP fragmentation?

Posted Feb 8, 2024 9:16 UTC (Thu) by Sesse (subscriber, #53779)
In reply to: So you think you understand IP fragmentation? by ju3Ceemi
Parent article: So you think you understand IP fragmentation?

Unfortunately, PMTU discovery doesn't actually work anymore either (it's hard to get the return packet through IP-based load balancers), so without fragmentation, you're pretty much stuck between a rock and a hard place.


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So you think you understand IP fragmentation?

Posted Feb 9, 2024 5:58 UTC (Fri) by DemiMarie (subscriber, #164188) [Link] (3 responses)

Is this because the load balancer doesn’t look at the part of the packet that was included in the ICMP response?

So you think you understand IP fragmentation?

Posted Feb 9, 2024 8:02 UTC (Fri) by Sesse (subscriber, #53779) [Link] (2 responses)

Most OSes and/or routers don't include enough of the original packet in the ICMP response to do that, unfortunately. So you don't know which backend to send the ICMP packet to, and you don't really want to flood it to all of them.

So you think you understand IP fragmentation?

Posted Feb 9, 2024 14:13 UTC (Fri) by DemiMarie (subscriber, #164188) [Link] (1 responses)

Is that an OS/router bug?

So you think you understand IP fragmentation?

Posted Feb 9, 2024 14:22 UTC (Fri) by Sesse (subscriber, #53779) [Link]

I guess a combination of hardware limitations and the specs not being clear about how much of the packet to return. In any case, it's just a fact of life now.


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