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Fix typo in fd_neigh4_probe.h #4221

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Feb 13, 2025
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Fix typo in fd_neigh4_probe.h #4221

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7 changes: 4 additions & 3 deletions src/waltz/neigh/fd_neigh4_probe.h
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@

If no matching neighbor table entry exists, the system should send
broadcast an ARP request (e.g. "who is 192.168.12.13? tell
192.168.12.4"). ARP relies to this request will then go to the
192.168.12.4"). ARP replies to this request will then go to the
kernel. The kernel also needs to be told that it should expect an
ARP reply to avoid drops.

Expand All @@ -26,15 +26,16 @@
`ip neigh add IP_ADDR nud incomplete`
Requires CAP_NET_ADMIN (to send RTM_NEWNEIGH)

2. Add a neighbor table entry, make the kernel increase the ARP
2. Add a neighbor table entry, make the kernel issue the ARP
request: `ip neigh add IP_ADDR nud incomplete use`
Requires CAP_NET_ADMIN (to send RTM_NEWNEIGH)

3. Send a UDP datagram, which indirectly makes the kernel do an ARP
3. Send a UDP datagram which indirectly makes the kernel do an ARP
request: `echo "hello" | nc -u IP_ADDR:65535`
Does not require privileges

4. Send an IP packet (ICMP echo, invalid ICMP, invalid next proto...)
which indirectly makes the kernel do an ARP request
`ping IP_ADDR -c 1`
Requires CAP_NET_RAW to create a SOCK_RAW socket

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