用3G拨号上网，之前一直是好的，现在总是遇到这个问题，感觉是这句话的问题：
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
但不知道如何修改，请问哪位大侠知道如何修改，3G网卡设备是中兴MF633
输出如下：
send (\d)
Serial connection established.
using channel 4
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB2
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xcb00ecc> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x6 <asyncmap 0x0> <auth chap MD5> <magic 0x1415d9c>
<pcomp> <accomp>]
sent [LCP ConfAck id=0x6 <asyncmap 0x0> <auth chap MD5> <magic 0x1415d9c>
<pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xcb00ecc> <pcomp> <accomp>]
rcvd [LCP DiscReq id=0x7 magic=0x1415d9c]
rcvd [CHAP Challenge id=0x1 <b436ada4e2b7e267b68b9655a085ae0e>, name =
"UMTS_CHAP_SRVR"]
sent [CHAP Response id=0x1 <c76cdea6d958464cfd6cac6801995428>, name = "card"]
rcvd [CHAP Success id=0x1 ""]
CHAP authentication succeeded
CHAP authentication succeeded
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
Modem hangup
Connection terminated.
------解决方案--------------------------------------------------------
貌似是这个烂MODEM死机/重启了