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那个路由是在 /etc/sysconfig/network-scripts/ifup 里定义好的（若你用的是 RedHat based 发行版）
# Add Zeroconf route.
if [ -z "${NOZEROCONF}" -a "${ISALIAS}" = "no" ]; then
ip route replace 169.254.0.0/16 dev ${REALDEVICE}
fi |
而什么是 Zeroconf 呢？我也不清楚，于是 google 了一下
http://www.redhat.com/magazine/010aug05/departments/tips_tricks/
How do I disable the zeroconf route so that the system will boot without the 169.254.0.0 / 255.255.0.0 route?
by Cynthia Davis
Symptom:
Every time the system boots, the zeroconf route (169.254.0.0) is enabled. You manually disable it by turning off the firewall and remove the route with 169.254.0.0 / 255.255.0.0 using the route command.
Example output of the route with the zeroconf route enables would like similar to the following:
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.15.50.0 * 255.255.252.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
Solution:
To disable the zeroconf route during system boot, edit the /etc/sysconfig/network file and add the following NOZEROCONF value to the end of the file:
NETWORKING=YES
HOSTNAME=localhost.localdomain
NOZEROCONF=yes
Additional Information:
Find out more about zeroconf at http://www.zeroconf.org/.
于是我又去了 http://www.zeroconf.org/ 看了一下，由于内容很多，我没有完全看完，先告诉你这里有讲为什么
至于 unset USERNAME 的用意，就是取消对变量 USERNAME 的定义并删除变量（在 shell 里）
做这个的原因是之前一定有对 USERNAME 的定义，这里 unset 是释放而已
man unset 可以获得更多信息
unset [-fv] [name ...]
For each name, remove the corresponding variable or function.
If no options are supplied, or the -v option is given, each name
refers to a shell variable. Read-only variables may not be
unset. If -f is specifed, each name refers to a shell function,
and the function definition is removed. Each unset variable or
function is removed from the environment passed to subsequent
commands. If any of RANDOM, SECONDS, LINENO, HISTCMD, FUNCNAME,
GROUPS, or DIRSTACK are unset, they lose their special proper-
ties, even if they are subsequently reset. The exit status is
true unless a name does not exist or is readonly.
[ 本帖最后由 platinum 于 2007-9-22 09:44 编辑 ] |
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发表于 2007-09-21 18:03
发表于 2007-09-21 19:55
