control/diagnose IPv6 Neighbor
Discovery Protocol (NDP)
ndp command manipulates the address
mapping table used by the Neighbor Discovery Protocol (NDP).
-a(dump NDP entries) every wait seconds.
- Dump the currently existing NDP entries. The following information will be
- The IPv6 address of the neighbor.
- Linklayer Address
- The linklayer address of the neighbor. If the address is not available, it will be displayed as “(incomplete)”.
- The network interface associated with the neighbor cache entry.
- The time until expiry of the entry. If the entry is marked “permanent”, it will never expire.
- The state of the neighbor cache entry, as a single letter:
- Unknown state (should never happen).
- Flags on the neighbor cache entry, in a single letter. They are: local (‘l’), Router (‘R’) and proxy neighbor advertisement (‘p’). This field may be followed by a decimal number, representing the number of NS probes the node has sent during the current state.
- Erase all the NDP entries.
- Delete the specified NDP entry.
- Parse entries from file to be inserted in the
neighbor cache. See the
-soption for a description of the file format.
- View ND information for the specified interface.
- Do not perform domain name resolution. If a name cannot be resolved without DNS, an error will be reported.
-snodename ether_addr [
- Register an NDP entry for the node called nodename with the Ether address
ether_addr. The Ethernet address is given as six hexadecimal bytes
separated by colons. The entry will be permanent unless the word
tempis given in the command. If the word
proxyis given, this system will act as an ND Proxy server, responding to requests for nodename even though the node address is not its own.
- Print a timestamp on each entry, making it possible to merge output with
tcpdump(8). Most useful when used with
- Select the routing domain.
ndp utility exits 0 on success,
and >0 if an error occurs.
ip6(4), sysctl.conf(5), arp(8), sysctl(8), tcpdump(8)
ndp command first appeared in the WIDE
Hydrangea IPv6 protocol stack kit.