今天新裝了Redhat 5.4企業版，配置了一下PPPoe，准備就駕著本本遨游了，可是令我奇怪的是，ppp的連接不停的掉線，新開一個終端，一直在Ping，發現網絡隔一分鐘左右就自動掉一次，然後自動重新連接，查看message日志，發現有如下內容，不斷重復：
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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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，我也在這兩個文件上浪費了挺多的時，測試了挺久時間，網絡狀況依然如故，後來一想，平常修改IP的設置之類的都在網卡上設置的，就試著在 vi /etc/sysconfig/network-scripts/ifcfg-ppp0 裡面作了修改，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
將此文件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。