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Prefer raw-eth sending for ND scan

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This commit is contained in:
dmiller 2026-03-23 16:24:27 +00:00
parent 367890df09
commit b64e0cb9f5
1 changed files with 7 additions and 0 deletions
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7
scan_engine.cc
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@ -956,6 +956,13 @@ void UltraScanInfo::Init(std::vector<Target *> &Targets, const struct scan_lists
assert(!(sendpref & PACKET_SEND_IP_STRONG));
sendpref = PACKET_SEND_ETH;
}
else if (ping_scan_nd && !(sendpref & PACKET_SEND_IP_STRONG)) {
/* We prefer eth sending for ND, because otherwise the OS may convert
* multicast to unicast (M2U) and we end up sending a Neighbor
* Unreachability Detection probe instead of Neighber Discovery. It will
* still work for host discovery, but doesn't give us a MAC address. */
sendpref = PACKET_SEND_ETH_WEAK;
}
if (!raw_socket_or_eth(sendpref, Targets[0]->deviceName(), Targets[0]->ifType(),
&rawsd, &ethsd)) {
fatal("Couldn't open a raw socket or eth handle.");