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

[Simon Goldschmidt]

Follow-up Comment #1, bug #21107 (project lwip):

This bug doesn't seem to exist because 'RFC792 has been slavishly followed',
but because of incorrect use of ip_output_if(). ICMP_TTL is passed to this
function, but because IP_HDRINCL is also passed, the TTL is not changed in the
existing IP header.

I think what the programmer meant was setting the TTL for every outgoing ICMP
packet to ICMP_TTL. But I'm not really sure what you mean with:

> The LwIP code should set the TTL and then recalculate
> (rather than just "adjust") the TTL.

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  <http://savannah.nongnu.org/bugs/?21107>

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