Description of problem:

This one's hilarious . . . the ifup scripts (eg.
/etc/sysconfig/network-scripts/ifup-eth ) contain lines like:

ip route replace default ${SRC} ${WINDOW:+window $WINDOW} dev ${REALDEVICE}

And guess what?  GNU screen sets the environment variable $WINDOW to
the number of the current window you're in, so if you're in a non-zero
screen window, the tcp window gets set to a small value, killing network
performance.

Version-Release number of selected component (if applicable):
at least fc 2 and 4

How reproducible:
run screen, add a window (^t c), switch to that window (^t 1).

# netstat -rn

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
0.0.0.0         192.168.38.1    0.0.0.0         UG        0 0          0

# ifup bond0:9

# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
0.0.0.0         192.168.38.1    0.0.0.0         UG        0 1          0


lo and behold, the tcp window is jacked.  Here's why:
# echo $WINDOW
1  (or whatever the number of your GNU screen window is)


Expected results:

the network scripts should rely on something as likely to cause name clashes as
$WINDOW


Additional info: