Here’s a neat script for checking speed/duplex on your SPLAT nic’s.
Here’s a neat script for checking speed/duplex on your SPLAT nic’s.
Ok, I admit I have copied this article, but it’s still a great one.
It’s nice to have somewhere so I find it when needed.
For IP, HSRP allows one router to automatically assume the function of the second router if the second router fails. HSRP is particularly useful when the users on one subnet require continuous access to resources in the network.
Consider the network shown in Figure 9-1. Router A is responsible for handling packets between the Tokyo segment and the Paris segment, and Router B is responsible for handling packets between the Tokyo segment and the New York segment. If the connection between Routers A and C goes down or if either router becomes unavailable, fast converging routing protocols, such as the Enhanced Interior Gateway Routing Protocol (Enhanced IGRP) and Open Shortest Path First (OSPF) can respond within seconds so that Router B is prepared to transfer packets that would otherwise have gone through Router A.
Here’s how you install snmp on CentOs. I’m putting it up because I always forget the snmpconf command.
yum install net-snmp
yum install net-snmp-utils
snmpconf -g basic_setup
But… Don’t forget to
chkconfig snmpd on
and of course
service snmpd start
By the way , here’s the chkconfig parameters:
chkconfig –list [name]
chkconfig –add name
chkconfig –del name
chkconfig [--level levels] name <on|off|reset>
chkconfig [--level levels] name
I use chkconfig –list all the most.
I always forget this so I’ll just make a quick post with it.
Let’s say you need to access something from you Xen Server that isn’t reachable via your default route. No you can of course just add a static route with the route command.
The problem with this is that it doesn’t stick after reboot, and neither does it stick even if I put it /etc/rc.local or any other config file.
To solve it you have to use the xen commands. Here’s a quick howto.