CDMA拨号的问题 - UNIX Resources Network

我用CDMA拨号，也已经拨通，但奇怪的是只要我一发送数据，没多久，大概几十秒吧，ppp就会自动更换得到的IP，但保持网关IP，大家碰到过这种情况吗？

/var/log/message如下
一发送数据
Oct 14 22:22:14 (none) daemon.debug pppd[67]: rcvd [LCP ConfReq id=0x6 <mru 1514> <asyncmap 0x0> <auth chap MD5> <magic 0xf6075661> <pcomp> <accomp>]
Oct 14 22:22:14 (none) daemon.info pppd[67]: Connect time 0.7 minutes.
Oct 14 22:22:14 (none) daemon.info pppd[67]: Sent 378 bytes, received 0 bytes.
Oct 14 22:22:14 (none) daemon.debug pppd[67]: Script /etc/ppp/ip-down started (pid 132)
Oct 14 22:22:14 (none) daemon.warn pppd[67]: Warning - secret file /etc/ppp/pap-secrets has world and/or group access
Oct 14 22:22:14 (none) daemon.debug pppd[67]: sent [LCP ConfReq id=0x2 <mru 1412> <asyncmap 0x0> <magic 0x3510b3b0>]
Oct 14 22:22:14 (none) daemon.debug pppd[67]: sent [LCP ConfRej id=0x6 <pcomp> <accomp>]
Oct 14 22:22:14 (none) daemon.debug pppd[67]: Script /etc/ppp/ip-down finished (pid 132), status = 0xff
Oct 14 22:22:14 (none) daemon.debug pppd[67]: rcvd [LCP ConfAck id=0x2 <mru 1412> <asyncmap 0x0> <magic 0x3510b3b0>]
Oct 14 22:22:14 (none) daemon.debug pppd[67]: rcvd [LCP ConfReq id=0x7 <mru 1514> <asyncmap 0x0> <auth chap MD5> <magic 0xf6075661>]
Oct 14 22:22:14 (none) daemon.debug pppd[67]: sent [LCP ConfAck id=0x7 <mru 1514> <asyncmap 0x0> <auth chap MD5> <magic 0xf6075661>]
Oct 14 22:22:14 (none) daemon.debug pppd[67]: rcvd [CHAP Challenge id=0x8 <16b1fc4cf16b0b3b3e1b075ee0ebc725>, name = "BJ-PDSN-2"]
Oct 14 22:22:14 (none) daemon.warn pppd[67]: Warning - secret file /etc/ppp/chap-secrets has world and/or group access
Oct 14 22:22:14 (none) daemon.debug pppd[67]: sent [CHAP Response id=0x8 <bc5f5e5ab710a765df96605af562a58f>, name = "CARD"]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: rcvd [CHAP Success id=0x8 "00"]
Oct 14 22:22:15 (none) daemon.info pppd[67]: CHAP authentication succeeded:
Oct 14 22:22:15 (none) daemon.notice pppd[67]: CHAP authentication succeeded
Oct 14 22:22:15 (none) daemon.debug pppd[67]: sent [CCP ConfReq id=0x2 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: sent [IPCP ConfReq id=0x3 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: rcvd [IPCP ConfReq id=0x9 <compress VJ 0f 00> <addr 220.192.0.2>]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: sent [IPCP ConfAck id=0x9 <compress VJ 0f 00> <addr 220.192.0.2>]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: rcvd [LCP ProtRej id=0xa 80 fd 01 02 00 0f 1a 04 78 00 18 04 78 00 15 03 2f]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: Protocol-Reject for 'Compression Control Protocol' (0x80fd) received
Oct 14 22:22:15 (none) daemon.debug pppd[67]: rcvd [IPCP ConfNak id=0x3 <compress VJ 0f 00> <addr 220.207.69.192> <ms-dns1 220.192.0.130> <ms-dns3 220.192.8.58>]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: sent [IPCP ConfReq id=0x4 <compress VJ 0f 00> <addr 220.207.69.192> <ms-dns1 220.192.0.130> <ms-dns3 220.192.8.58>]
Oct 14 22:22:15 (none) daemon.debug pppd[67]: rcvd [IPCP ConfAck id=0x4 <compress VJ 0f 00> <addr 220.207.69.192> <ms-dns1 220.192.0.130> <ms-dns3 220.192.8.58>]
Oct 14 22:22:15 (none) daemon.notice pppd[67]: local IP address 220.207.69.192
Oct 14 22:22:15 (none) daemon.notice pppd[67]: remote IP address 220.192.0.2
Oct 14 22:22:15 (none) daemon.notice pppd[67]: primary DNS address 220.192.0.130
Oct 14 22:22:15 (none) daemon.notice pppd[67]: secondary DNS address 220.192.8.58
Oct 14 22:22:15 (none) daemon.debug pppd[67]: Script /etc/ppp/ip-up started (pid 133)
Oct 14 22:22:15 (none) daemon.debug pppd[67]: Script /etc/ppp/ip-up finished (pid 133), status = 0xff

我的pppd拨号的option为
asyncmap 0
crtscts
debug
modem
lock
mtu 1412
mru 1412
unit 0
nopcomp
noaccomp
nodefaultroute
noipdefault
usepeerdns
user CARD

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