[lwip-devel] [bug #21107] LwIP doesn't reset the TTL in ICMP Echo Replies

[Simon Goldschmidt]

Follow-up Comment #6, bug #21107 (project lwip):

>> But the checksum can still be adjusted (which is much faster),
>> instead of being completely recalculated! 

> Yes, but in this case, the adjustment is more complex (icmp echo
> change, icmp checksum, and ip ttl)?

The icmp echo change is already done, so in addition to your suggested patch,
we simply have to substract the old ttl and add the new ttl to the checksum
and that should be it.

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