pppoe 上网后，经常出现 DNS 配置文件被修改

[liaotao]

pppoe 上网后，运行一段时间。经常出现 DNS resolve.conf配置文件被修改成
search ETNA
192.168.1.254。此时用域名无法登录，但是用IP地址仍然可以访问

我的interface配置文件内容如下
This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# This entry denotes the loopback (127.0.0.1) interface.
auto lo
iface lo inet loopback

# This entry was created during the Debian installation
auto eth0
iface eth0 inet dhcp

auto dsl-provider
iface dsl-provider inet ppp
provider dsl-provider

pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf

请问如何解决这个问题

[field]

用chattr +i 修改文件权限试试。