very strange connection problem on FC5 installation

[Craig White]

On Sun, 2006-04-02 at 08:19 -0700, Globe Trotter wrote:
> Dear list,
> 
> I have been using Redhat9 and Fedora Core1-4, with help from members on this
> list. Two days ago, I installed Fedora Core 5 and everything came up smoothly.
> Though the booting and shutting down is very slow. However, I have a serious
> problem, which I can not figure out at all.
> 
> I can not access most sites on the web, using firefox or wget. These sites
> include mail.yahoo.com, and most importantly www.google.com,
> www.fedora.redhat.com. Mauriat Miranda's installation notes, among the ones I
> tried. stanton-finley.net is however accessible, but not all the sites he
> mentioned. Can someone please tell me what is going on? Where to look? 
> 
> I am using a Dell Latitude C840, with 512MB RAM. I am on an ADSL modem (Qwest
> Actiontec GT701-WG) which may be the problem, but am indeed very confused,
> because things "worked fine" two days ago. The modem theoretically supports
> linux, and my ISP does, I know that. Though they are not very learned, given
> that they probably field very few commands from Linux customers.
> 
> Anyway, I have SELinux enabled to enforcing, and my router firewall switched
> off. I have had this setup for a while.
> 
> I don't know what other information to provide, or where to look. Can someone
> please help?
> 
> (By the way, I am typing this e-mail on my old nemesis, Windoze XP, in case you
> were wondering....)
> 
> Many thanks and best wishes,
> Trotter
----
SELinux issues will show up in /var/log/messages and in dmesg

I would suggest that you try turning ipv6 off first...

add the following to the bottom of /etc/modprobe.conf and reboot to see
if it helps:
alias net-pf-10 off

Craig