Configure Firewall

[bram88]

how do i look the configuration of firewall on linux?

thanks

[atreyu]

What distro are you using?

Typically, you can list the iptables rules with:

iptables -L

and you can print them in a config file format with:

iptables --save

[bram88]

hi,

im using Centos on the server, and i have tried your command but it just return "command not found"

thanks

[atreyu]

Did you run the iptables command as a regular user, or as root? I should have mentioned you must be root (iptables is in /sbin which is not in the regular user's path). You could also try:

/sbin/iptables -L

But if you get the "No such file or directory" error, see if the package is installed:

rpm -qv iptables

I'd be surprised if it is not installed, b/c it is one of those packages that is always installed, no matter how small an install you choose. Anyway, you can install it with:

yum install iptables

Or if yum is not yet set up, get the RPM from your original installation media and install it, e.g.:

rpm -ivh /media/dvd/CentOS/iptables-[0-9].*.rpm

Then start it with:

service iptables start

Note: do the yum/rpm/service commands as root

[bram88]

after lunched the command "/sbin/iptables -L" it show me that all connection are allowed

then, i have configured snmp on these linux, but why occasionally it doesnt work as i expected ? sometimes my snmp manager server could communicate with my linux through SNMP, but next time the connection is lost

i have using snmpwalk to test it and its working fine

any suggestions ?

btw thanks for your big help, it's really2 helping me

[atreyu]

So what exactly is the role of your Linux machine in regards to your SNMP environment? Is it supposed to be acting as an SNMP managed device (running an agent and reporting to an SNMP manager)? Or are you just using it to verify that another SNMP device is working (which your use of the snmpwalk command suggests)?

Show any commands that you have tried, and what the exact errors you get, if any.