[c-nsp] Linux for Cisco Engineers Tutorials?

[A.L.M.Buxey at lboro.ac.uk]

hi,

what sort of linux/unix battles are you having? the debug tools
are similar to the cisco ones you are used to - ping, traceroute,
arp, etc

with configuration,  ipconfig is the tool to check your interfaces,

'tcpdump' can be used to sniff traffic..eg tcpdump -eqnntl -i eth0 host 128.64.5.4

however, many distros use different locations for their neworking
config - eg, some use /etc/sysconfig/net*, others have eg
/etc/networking/* files etc.

are you using subinterfaces, 802.1q trunks etc?  ifconfig etc operate
with such environments.  the other thing to be aware of is, of course,
host based firewalls.  iptables -L -n will show any in operation.

finally, security tools such as 'selinux' may block networking
operations..and certainly interdaemon comms if they havent been allowed.
debug this be becoming permissive and then check the logs.
there are many tools in the selinux toolset to check what and why
things are failing,

alan