---
name: "ndppd.conf"
section: "5"
platform: "linux"
package: "ndppd"
version: "0.2.5-6"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ndppd.conf"
---

# ndppd.conf(5)

configuration file for ndppd

## NAME

ndppd.conf - configuration file for ndppd

## DESCRIPTION

The syntax is as follows:

```
proxy eth0 {
   rule 1234:5678::/96 {
   }
}
```

The configuration file must contain one or more **proxy** sections, and each of these section must contain one or more **rule** sections.

The **ndppd** daemon listens on the interface specified as an argument to the **proxy** section. Once a **Neighbor Solicitation** message arrives, it will try to match the target address against the address specified as the argument of the **rule** section.

## OPTIONS

- proxy \<interface\>

  Adds a proxy and binds it to the specified *interface*. See below for information about **proxy options**.

## PROXY OPTIONS

- rule \<address\>

  Adds a rule with the specified *address* to the proxy. It may be a an IP such as 1234::1 or a subnet such as 1111::/96. See below for information about **rule options**.

- ttl \<value\>

  Controls how long **ndppd** will cache an entry. This is in milliseconds, and the default value  is 30000 (30 seconds).

- timeout \<value\>

  Controls how long **ndppd** will wait for a Neighbor Advertisement message after forwarding a Neighbor Solicitation message according to the rule. This is in milliseconds, and the default value is 500 (.5 second).

- router \<yes\|no\>

  Controls if **ndppd** should send the *router* bit when sending Neighbor Advertisement messages. The default value here is **yes**.

## RULE OPTIONS

Specify a method here. See below.

## METHOD

One of the following options must be specified in the **rule** section. All of these are mutually exclusive options, and cannot be combined.

- iface \<interface\>

  Specify which *interface* the Neighbor Solicitation message will be sent out through.

- auto

  **(NEW)** If this option is specified **ndppd** will attempt to detect which interface to use in order to forward Neighbor Solicitation Messages, by reading the routing table **/proc/net/ipv6\_route**.

- static

  **(NEW)** This option tells **ndppd** that it should immediately respond to a Neighbor Solicitation Message without querying an internal interface. Note that it's recommended that you use this option sparingly, and with as high prefix length as possible. This is to make sure upstream routers are not polluted with spurious neighbor entries.

  If no rule option has been specified, it will default to **static** in order to be compatible with **0.2.1**. This will, however, produce a warning, and most likely not work in future versions of **ndppd**.

## AUTHOR

Daniel Adolfsson \<daniel@priv.nu\>

## SEE ALSO

**[ndppd(1)](/ndppd/1.md)**