Help me clear ALL dhcp (client) cache!

carboncopy · 06-28-2004, 04:35 AM

Hi!

I need to clean up all dhcp stuff (cache, info whatever ) that I received from dhcp server.

rotvogel · 06-28-2004, 05:14 AM

Depends on what client you are using. The Slackware default is dhcpcd and writes cache information in the /etc/dhcpc directory. Stop the client from running , wipe all files exept dhcpcd-eth[n].exe and your cache will be empty.

carboncopy · 06-28-2004, 05:17 AM

I am on a campus network. My Slackware can't ping to anybody or access the Internet. This has happen before. But that time I just format and reinstall my Slackware 10 rc to Slackware 10.0.

I get dhcp IP add from the dhcp server.

THe same machine can get into the Internet and all other things on WindowsXP.

So, I know that the dhcp server has changed the configuration on my Slackware which causes me to not able to use the Internet. I am not going to reinstall again.

when I ping I get this responds:

Code:

PING 10.5.0.79 (10.5.0.79) 56(84) bytes of data
From 10.5.0.163 icmp_seq=1 Destination Port Unreachable
From 10.5.0.163 icmp_seq=1 Destination Port Unreachable
From 10.5.0.163 icmp_seq=1 Destination Port Unreachable
From 10.5.0.163 icmp_seq=1 Destination Port Unreachable
From 10.5.0.163 icmp_seq=1 Destination Port Unreachable
From 10.5.0.163 icmp_seq=1 Destination Port Unreachable
ping: sendmsg: Operation not permitted
From 10.5.0.163 icmp_seq=2 Destination Port Unreachable
ping: sendmsg: Operation not permitted

I can use netwatch and ethereal to watch the network.
Argh! I am angry.

carboncopy · 06-28-2004, 05:21 AM

Quote:

Originally posted by rotvogel
Depends on what client you are using. The Slackware default is dhcpcd and writes cache information in the /etc/dhcpc directory. Stop the client from running , wipe all files exept dhcpcd-eth[n].exe and your cache will be empty.

Tried it, but still can't solve my network problem.

carboncopy · 06-28-2004, 08:42 AM

All right, I managed to solved the problem. The problem is with my rc.firewall script. I can't remember what have I changed, but it is not working anymore. Will write my own script this time.

Sorry for the false alarm. Anyhow, it was an opportunity to learn about Linux dhcpcd (client) capabilities. Do you know you can "change" your MAC address? Will not exactly change, but we can report a different CLIENTID to the dhcpd server.

By the way, dhcpcd -k will SIGHUP dhcpc and also clear the cache.

man dhcpcd to learn more.