Linux中ADSL定时掉线问题

今天新装了Redhat 5.4企业版，配置了一下PPPoe，准备就驾着本本遨游了，可是令我奇怪的是，ppp的连接不停的掉线，新开一个终端，一直在Ping，发现网络隔一分钟左右就自动掉一次，然后自动重新连接，查看message日志，发现有如下内容，不断重复：

Aug  5 23:20:53 localhost pppd[5754]: pppd 2.4.4 started by root, uid 0

Aug  5 23:20:53 localhost pppd[5754]: Using interface ppp0

Aug  5 23:20:53 localhost pppd[5754]: Connect: ppp0 <--> /dev/pts/0

Aug  5 23:20:53 localhost pppoe[5755]: PPP session is 33288

Aug  5 23:20:54 localhost pppd[5754]: appear to have received our own echo-reply!

Aug  5 23:20:54 localhost pppd[5754]: PAP authentication succeeded

Aug  5 23:20:54 localhost pppd[5754]: local  IP address 10.0.0.59

Aug  5 23:20:54 localhost pppd[5754]: remote IP address 10.0.0.1

Aug  5 23:21:14 localhost pppd[5754]: appear to have received our own echo-reply!

Aug  5 23:21:34 localhost pppd[5754]: appear to have received our own echo-reply!

Aug  5 23:21:54 localhost pppd[5754]: No response to 3 echo-requests

Aug  5 23:21:54 localhost pppd[5754]: Serial link appears to be disconnected.

Aug  5 23:21:54 localhost pppd[5754]: Connect time 1.0 minutes.

Aug  5 23:21:54 localhost pppd[5754]: Sent 6578 bytes, received 13132 bytes.

Aug  5 23:21:54 localhost pppd[5754]: Connection terminated.

Aug  5 23:21:54 localhost pppoe[5755]: read (asyncReadFromPPP): Session 33288: Input/output error

Aug  5 23:21:54 localhost pppoe[5755]: Sent PADT

Aug  5 23:21:54 localhost pppd[5754]: Exit.

Aug  5 23:21:54 localhost adsl-connect: ADSL connection lost; attempting re-connection.

Aug  5 23:21:59 localhost pppd[5846]: pppd 2.4.4 started by root, uid 0

Aug  5 23:21:59 localhost pppd[5846]: Using interface ppp0

Aug  5 23:21:59 localhost pppd[5846]: Connect: ppp0 <--> /dev/pts/0

Aug  5 23:21:59 localhost pppoe[5847]: PPP session is 33544

Aug  5 23:21:59 localhost pppd[5846]: appear to have received our own echo-reply!

Aug  5 23:21:59 localhost pppd[5846]: PAP authentication succeeded

Aug  5 23:22:00 localhost pppd[5846]: local  IP address 10.0.0.5

Aug  5 23:22:00 localhost pppd[5846]: remote IP address 10.0.0.1

Aug  5 23:22:19 localhost pppd[5846]: appear to have received our own echo-reply!

Aug  5 23:22:39 localhost pppd[5846]: appear to have received our own echo-reply!

Aug  5 23:22:59 localhost pppd[5846]: No response to 3 echo-requests

Aug  5 23:22:59 localhost pppd[5846]: Serial link appears to be disconnected.

Aug  5 23:22:59 localhost pppd[5846]: Connect time 1.0 minutes.

Aug  5 23:22:59 localhost pppd[5846]: Sent 31464 bytes, received 78172 bytes.

Aug  5 23:23:00 localhost pppd[5846]: Connection terminated.

Aug  5 23:23:00 localhost pppoe[5847]: read (asyncReadFromPPP): Session 33544: Input/output error

Aug  5 23:23:00 localhost pppoe[5847]: Sent PADT

Aug  5 23:23:00 localhost pppd[5846]: Exit.

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随即在网上搜了一下，发现网上出现此问题的人也不在少数，要么修改/etc/ppp/options的内容，要么就是修改/etc/ppp/pppoe-server-options的内容，我也在这两个文件上浪费了挺多的时，测试了挺久时间，网络状况依然如故，后来一想，平常修改IP的设置之类的都在网卡上设置的，就试着在 vi /etc/sysconfig/network-scripts/ifcfg-ppp0  里面作了修改，原文件如下：

USERCTL=no

BOOTPROTO=dialup

NAME=DSLppp0

DEVICE=ppp0

TYPE=xDSL

ONBOOT=no

PIDFILE=/var/run/pppoe-adsl.pid

FIREWALL=NONE

PING=.

PPPOE_TIMEOUT=80

LCP_FAILURE=3

LCP_INTERVAL=20

CLAMPMSS=1412

CONNECT_POLL=6

CONNECT_TIMEOUT=60

DEFROUTE=yes

SYNCHRONOUS=no

ETH=eth0

PROVIDER=DSLppp0

USER=46804

PEERDNS=no

DEMAND=no

IPV6INIT=no

PERSIST=no

将此文件内的二个地方作了修改：

LCP_FAILURE=30

LCP_INTERVAL=30

至此，一直末出现不间断掉线的情况了，其实将上面两个语句的任意一个值，修改得大些即可解决问题。

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