PPPOE服务器和syslog有冲突?

Question

最近弄PPPOE拨号服务器，采用的是 rp-pppoe,在调试过程中发现一个奇怪的问题。

打开 syslog 服务（klogd 和 syslogd 进程）时，客户机无法拨号，服务器日志中不断显示如下信息：
Using interface ppp3
Connect: ppp3 <--> /dev/pts/10
sent [LCP ConfReq id=0x1 <auth chap MD5> <magic 0x54735a09>]
rcvd [LCP ConfReq id=0x2 <mru 1492> <magic 0xf32de31a>]
sent [LCP ConfRej id=0x2 <mru 1492>]
sent [LCP ConfReq id=0x1 <auth chap MD5> <magic 0x54735a09>]
sending SIGTERM to process 8682
Terminating on signal 15
sent [LCP TermReq id=0x2 "User request"]
sent [LCP TermReq id=0x3 "User request"]
using channel 59
Using interface ppp4
Connect: ppp4 <--> /dev/pts/11
Connection terminated.
Modem hangup

linux客户端拨号失败信息：
Using interface ppp0
Connect: ppp0 <--> /dev/pts/2
LCP: timeout sending Config-Requests
Connection terminated.
Using interface ppp0
Connect: ppp0 <--> /dev/pts/3
PADT: Generic-Error: RP-PPPoE: Child pppd process terminated
tcflush failed: Bad file descriptor
pppoe: read (asyncReadFromPPP): Session 4: Input/output error

windows拨号失败信息：
无法建立到远程计算机的连接，指定端口没有连接

一旦关闭 syslog 服务，客户机立即拨号成功。

我的环境：
   Host:       LFS-6.x
   rp-pppoe:   3.8
   ppp:        2.4.4 (with mppe-mppc patched)
   kernel:     2.6.18 (built-in mppe-mppc support)

实在想不出为什么，敬请指教，Thanks very much !