regulatre's questions

Say I have two hosts - Using fictitious IPs for this example, say host A has IP 1.1.1.1. host B has two IPs - 2.2.2.2 and 2.2.2.3.

If host B is listening on port 8888, and sees a packet come in from 1.1.1.1, produces a response and sends it out on a different IP than the original connection was made to, does this suggest that host A (1.1.1.1) is not going to see the response packet?

1. 1.1.1.1:8888 -> 2.2.2.2:8888 (request)
2. 2.2.2.3:8888 -> 1.1.1.1:8888 (response)

My understanding of sockets is that a socket consists of an IP and a port so if the server responds to a client on a brand new IP that the client didn't use to establish the connection, the client won't get the response.

Say I built 1000 servers from the same OS Image, everything is the same including SNMP configs (They all have unique IP addresses of course). For each server, I want to monitor the same 12 services, all via SNMP, using Nagios.

In the Nagios config, is there a way to configure each server such that I don't have to repeat the 12 service entries in every single host file?

Something like: 
    Host MyHost {
      ServiceGroup 12Monkeys;
    }

Better yet, is there a way to say "for these 1000 servers, monitor these 12 services"?

Servicegroup 12Monkeys {
  Servers: 192.168.0.0/24;
}

Thanks!

How do I find out which kernel module (as seen by typing lsmod) is servicing a particular device in /dev ?

In other words, say I have a device, /dev/mouse0 and I want to find out which kernel module is installed to service that device. How do I do that?

Another way to look at this is, some loaded kernel modules associate themselves with a device in /dev. How does one find out which device(s) a module is "attached" to?