unable to renew ip

[lina <lina.lastname@gmail.com>]

Hi,

I use dhclient and just switch to google dns server.

For months, I have bees stuck with the eth0 ip address 172.21.100.159

For couple of hours, the interaction is unbearably slow.

I changed to another cable, tried the `# dhcline -r` and `# dhclient`,
but all not works.

Are there some suggestions about how to change the IP address?

Thanks,