On 4/22/21 11:00 AM, Mantas Mikulėnas
wrote:
...
I'm curious about what brought this problem into existence in the first place. Why *is* it necessary to contact a random address within the network? (If it's to check that the physical interface is working, then just the fact that you somehow acquired a lease would be enough. no?)
The only non-destructive way I've found to test whether a real or virtual nic interface computes packet checksums properly is to send a small packet to a random address temporarily added to the suspect interface. If a bad udp checksum is detected, invert tx-checksum-ip-generic.
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