Linux中ADSL定時掉線問題

今天新裝了Redhat 5.4企業版，配置了一下PPPoe，準備就駕著本本遨遊了，可是令我奇怪的是，ppp的串連不停的掉線，新開一個終端，一直在Ping，發現網路隔一分鐘左右就自動掉一次，然後自動重新串連，查看message日誌，發現有如下內容，不斷重複：

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.

本欄目更多精彩內容：http://www.bianceng.cn/OS/Linux/

隨即在網上搜了一下，發現網上出現此問題的人也不在少數，要麼修改/etc/ppp/options的內容，要麼就是修改/etc/ppp/pppoe-server-options的內容，我也在這兩個檔案上浪費了挺多的時，測試了挺久時間，網路狀況依然如故，後來一想，平常修改IP的設定之類的都在網卡上設定的，就試著在 vi /etc/sysconfig/network-scripts/ifcfg-ppp0  裡面作了修改，原檔案如下：

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

將此檔案內的二個地方作了修改：

LCP_FAILURE=30

LCP_INTERVAL=30

至此，一直末出現不間斷掉線的情況了，其實將上面兩個語句的任意一個值，修改得大些即可解決問題。