NDP daemon for an host.
The ndpd-host command manages the Neighbor Discovery Protocol (NDP) for non-kernel activities: Router Discovery, Prefix Discovery, Parameter Discovery and Redirects. The ndpd-host command deals with the default route, including default router, default interface and default interface address.
Interfaces
The ndpd-host command knows about IEEE and CTI point to point interfaces. The ndpd-host command exchanges packets on all the known interfaces UP with a Link-Local Address. Any change of status of an interface is detected. If an interface goes down or loses its Link-Local address, the NDP processing is stopped on this interface. If an interface goes up, the NDP processing is started.
The IEEE interfaces are configured using the autoconf6 command. The PPP interfaces are configured using the pppd daemon. The token negotiation defines the Link-Local addresses. In order to send Router Advertisements over a CTI configured tunnel, it must have local and distant Link-Local addresses.
ndpd-host can generate Temporary Addresses as per RFC 4941. You can enable or disable temporary address generation for a particular prefix or interface by configuring the daemon in the tempaddr.conf file format. You can set the default preferred and valid lifetimes of Temporary Addresses using the -r option.
Note: For all the up point to point interfaces, ndpd-host sets a local route through the lo0 for local addresses.
| Item | Description |
|---|---|
| -c conffile | Specifies the SEND configuration file. By default, the configuration file is the /etc/ndpd/ndpdh.cnf file. In order to enable the SEND option, you must install the clic.rte fileset and OpenSSL. |
| -d | Enables debugging (exceptional conditions and dump). |
| -g | Allows the ndpd-host command to retain all the static global IPv6 address during initialization. |
| -r [ValidLifetime PreferredLifetime] | Enables Temporary Address generation. Along with -r flag, user can optionally specify default valid and preferred lifetimes for Temporary Addresses generated. By default, Temporary addresses are not generated, if this flag is not given. |
| -t | Adds a time stamp in each log. |
| -v | Logs all interesting events (daemon.info and console). |
| Item | Description |
|---|---|
| SIGUSR1 | Turns on verbose. |
| SIGUSR2 | Turns off verbose. |
| SIGINT | Dumps the current state of ndpd-host to syslog or stdout. |
| SIGTERM | Cleans up ndpd-host and exits. |
Attention RBAC users and Trusted AIX® users: This command can perform privileged operations. Only privileged users can run privileged operations. For more information about authorizations and privileges, see Privileged Command Database in Security. For a list of privileges and the authorizations associated with this command, see the lssecattr command or the getcmdattr subcommand.
| Item | Description |
|---|---|
| /etc/ndpd/ndpdh.cnf | Specifies the SEND file locations. |
| /etc/ndpd/cgaparams.sec | Specifies the configuration for each interface using the SEND option. |
| /etc/ndpd/sendh_anchor | Specifies the trusted anchor values necessary for the SEND option. |
| /etc/ndpd/tempaddr.conf | Specifies the router prefixes for which Temporary Address generation should be denied / allowed. The contents of the file are read only when ndpd-host is started with -r flag. |