Bug 460999

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.16) Gecko/20061201 Firefox/2.0.0.16 (Ubuntu-feisty)

ISP: Charter Communications
Network hardware topology:

Wall cable socket <-> coax <-> splitter (other fork is to a VoIP phone) <-> coax <-> cable modem <-> ethernet patch cable <-> NIC (a tulip ethernet card)

Specifically, all I get is some sort of an IP address, heaven knows how.  ifup eth0 hangs during DHCPDISCOVER, and ping refuses to work.

Also, I get a receive error racked up on ifconfig's report of eth0, about once every 5 seconds.

Here's what's odd.  Fresh installation of Ubuntu 7.04 (Feisty Fawn) works completely flawlessly.  A simple "dhclient eth0" in rc.local and everything is aOK.

Another oddball thing:  Booting into ubuntu, then chrooting into fedora and using fedora's binaries and libs (bind mounted the /dev and /proc dirs into the chroot), everything works just fine...  Chrooting into ubuntu from fedora, and it goes kablooey.  Effectively, ubuntu is running in the background and provides the kernel and devices (through said bind mounts), yet I am able to switch on my internet as if I had installed fedora...except with ubuntu as a supervisor it works.

I have ZERO errors under ubuntu, so I doubt I have bad hardware.

Strangely, fedora 9 isn't the only one to crap out with my internet conection.  Slackware 12.0 and opensuse (can't remember version) also fail to work out of the box with my internet, no matter how many times I ifconfig/ifup/ifdown my ethernet adapter.

Straight install of ubuntu is the only way I could get my internet to work at all.  Not so much as single ping worked on any of the other three.

Internet also works under ubuntu when it's itself running under Xen.

Interesting test:  Run ubuntu with xen, and bootstrap a fedora 9 guest, and test the guest.

Interesting information:  Only difference I found between the fedora install and the ubuntu install was the output of the "route" command.  One of the metrics was different...the ubuntu metric in question (2nd on the list) was 1000, whereas in fedora, it was 0.  Everything else (output of ifconfig, /etc/resolv.conf) was IDENTICAL for both systems.

Reproducible: Always

Steps to Reproduce:
1.  Install fedora 9, default options
or... use fedora 9 rescue mode and then chroot into the system.
2.  ifup eth0
3.  ping a pingable IP address (problem isn't in the DNS)
Actual Results:  
# ifdown eth0
(blah, releasing)
# ifup eth0
DHCPREQUEST
(repeats a few times)

Unable to determine IP information (or something like that)

# ping www.google.com
(hangs)

# ping 4.2.2.2
(hangs)

# ping ntp.ubuntu.com
(hangs)

# ping (my assigned IP address)
(hangs)


Expected Results:  
# ifup eth0
(blah)
DHCPDISCOVER blah...
DHCPOFFER blah...
DHCPREQUEST blah...
DHCPACK blah...

# ping www.google.com
(blah

Installing ubuntu solves every single problem, even if I later chroot into the fedora 9 system on my other hard drive...which was previously installed and which itself has internet trouble I boot it directly instead of booting ubuntu and then chrooting to fedora.

Since a chroot is inherited, I was using fedora's entire system, with the only difference being in the active kernel.