Pick up a liveCD, version doesn't matter, you could use any distro, as long as it ables you to enter to console.
# means run with root or sudo
1. Create a mountpoint
2. Mount /proc /sys /dev to chroot
# mkdir /mount/point
3. Copy resolv.conf to networking
# mount -o bind /proc /mount/point/proc
# mount -o bind /dev /mount/point/dev
# mount -o bind /dev/pts /mount/point/dev/pts
# mount -o bind /sys /mount/point/sys
4.Open bash in chroot
# cp /etc/resolv.conf /mount/point/etc/resolv.conf
5. Do what you have to do and then exit chroot
# chroot /mount/point /bin/bash
there may be more elegant way of achieving this, but this one has stuck to me.
Hope this helps someone, this is probably posted on multiple sites, but what the heck, now no need to search around