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Add a fault-injection mechanism that allows an arbitrary delay (configured via config/fault.h) to be added to any packets transmitted via the neighbour resolution mechanism, as a way of reproducing symptoms that occur only on high-latency connections such as a satellite uplink. The neighbour discovery mechanism is not a natural conceptual fit for this artficial delay, since neighbour discovery has nothing to do with transmit latency. However, the neighbour discovery mechanism happens to already include a deferred transmission queue that can be (ab)used to implement this artifical delay in a minimally intrusive way. In particular, there is zero code size impact on a standard build with no artificial delay configured. Implementing the delay only for packets transmitted via neighbour resolution has the side effect that broadcast packets (such as DHCP and ARP) are unaffected. This is likely in practice to produce a better emulation of a high-latency uplink scenario, where local network traffic such as DHCP and ARP will complete quickly and only the subsequent TCP/UDP traffic will experience delays. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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