Messages in this thread | | | Subject | Re: Van J compression? | From | Andi Kleen <> | Date | 03 Jan 1999 17:04:52 +0100 |
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In article <19990103052709.B2843@tantalophile.demon.co.uk>, lkd@tantalophile.demon.co.uk (Jamie Lokier) writes:
> But bear in mind that disabling VJ compression doesn't fix the problem > in some cases. (Though it makes the problem rarer). At least one PPP > link over a modem to an ISP gets consecutive TCPv4 checksum errors even > with `novj'.
Sometimes hard discs screw up (that is why do backups and RAID if you care about your data), sometimes network cable/gateways/systems corrupt packets.
Given the current state of cheap computer hardware and cables it is surprising that it only happens with a few ISPs. In short: computer networks are unreliable, bit errors are nothing uncommon even for end2end networks that have other checksums and you have to accept that sometimes a packet gets mangled. That is why TCP has a end2end checksum.
All standards say that packets with wrong checksum should be silently dropped, 2.2 will do that and turn off that debugging, I repeat, debugging message.
-Andi
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