Firefox Loads Some Sites Very Slow

It happens on Fedora 12 and Fedora 13 with both Firefox and Seamonkey. It turns out it is not a Firefox problem but a problem related to tcp_window_scaling. See the page http://linux.derkeiler.com/Mailing-Lists/Fedora/2010-02/msg00660.html.

To disable it

echo 0 > /proc/sys/net/ipv4/tcp_window_scaling


Permanently

# echo '"# Disable TCP window scaling" > sysctl.conf'
# echo '"net.ipv4.tcp_window_scaling=0" >> sysctl.conf'


Also see http://www.ecr6.ohio-state.edu/window-scaling.html.

Firefox Blurry Image with Zoom

To fix the problem, View->Zoom->Zoom Text only.

Ctrl-0 to reset zoom.

web fonts

These packages include popular fonts as Arial, Times New Roman, Tahoma, Verdana, as well as new Windows Vista and MS Office 2007 fonts. Learn more.

bash$ sudo rpm -Uvh \
http://avi.alkalay.net/software/webcore-fonts/webcore-fonts-3.0-1.noarch.rpm \

http://avi.alkalay.net/software/webcore-fonts/webcore-fonts-vista-3.0-1.noarch.rpm

IP Aliasing (eth0:1)

IP aliasing like eth0:1 is a legacy mechanism for creating secondary IP address on an interface. Network Manager does not really support it. Alternatively, to add a second IP to an interface, add IPADDR2, PREFIX2 and NETMASK2 in ifcfg-eth0 file.

However, the second ip address is not displayed in "ifconfig". To show the ip address, use "ip addr show command":

# ip addr show
1: lo:  mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0:  mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:0c:29:3a:e6:7d brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.128/24 brd 192.168.10.255 scope global eth0
    inet6 fe80::20c:29ff:fe3a:e67d/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1:  mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:0c:29:3a:e6:87 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.99/24 brd 192.168.1.255 scope global eth1
    inet 10.4.44.128/24 brd 10.4.44.255 scope global eth1
    inet6 fe80::20c:29ff:fe3a:e687/64 scope link 
       valid_lft forever preferred_lft forever

FC12: e2fsck: no such file or directory on boot

After upgraded to FC11 to FC12, entries like /dev/sda in fstab sometimes is not mounted properly. Had to use labels in order to mount properly. Since I have two disks, sometimes sda is first disk and other time is the second disk.