Gateways and monitoring

The address you are trying to monitor should be reachable using the interface the gateway is attached to, either directly or using a static route (check System ‣ Routes ‣ Status).

dpinger:.. sendto error: XXX

Usually found in System ‣ Log Files ‣ General, every code has a meaning, usually explained in errno.h (man errno)

Some common ones are explained below:

XX	Name	Description
55	ENOBUFS	No buffer space available. An operation on a socket or pipe was not performed because the system lacked sufficient buffer space or because a queue was full. Check connectivity from the machine itself using ping, most common mistakes are misconfigured routes, interface issues (disconnected) and policy based routing issues forcing traffic to the wrong target (using reply-to)
64	EHOSTDOWN	Host is down. A socket operation failed because the destination host was down. Expecting an (layer 2) ARP response but none was returned, often misconfigured subnets or hosts are actually not accessible over L2
65	EHOSTUNREACH	No route to host. A socket operation was attempted to an unreachable host The routing table is a good place to look (System ‣ Routes ‣ Status)

arpresolve: can’t allocate llinfo for..

This message usually means that the configured gateway lies outside the configured subnets for this firewall (for IPv4).

Tip

Double check the subnets of your interface and virtual IP’s, you can also use Interfaces ‣ Overview for a quick list of all configured addresses.