[root@localhost ppp]# pppd ttyS0
Using interface ppp0
Connect: ppp0 <--> /dev/ttyS0
Remote message: Login succeded
PAP authentication succeeded
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
local  IP address 192.168.35.225
remote IP address 195.5.50.34
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
CCP: timeout sending Config-Requests
Terminating on signal 2
Connect time 1.3 minutes.
Sent 1435 bytes, received 270 bytes.
Connection terminated.
[root@localhost ppp]# pppd ttyS0 debug
using channel 13
Using interface ppp0
Connect: ppp0 <--> /dev/ttyS0
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x7222eb9d> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
sent [LCP ConfAck id=0xa <asyncmap 0x0> <auth pap> <magic 0x7e347ede> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x7222eb9d> <pcomp> <accomp>]
sent [PAP AuthReq id=0x1 user="exgrafika" password=<hidden>]
rcvd [PAP AuthAck id=0x1 "Login succeded"]
Remote message: Login succeded
PAP authentication succeeded
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>]
rcvd [IPCP ConfReq id=0x3 <addr 195.5.50.34> <compress VJ 0f 01>]
sent [IPCP ConfAck id=0x3 <addr 195.5.50.34> <compress VJ 0f 01>]
rcvd [CCP ConfReq id=0x15 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x15 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
rcvd [IPCP ConfNak id=0x1 <addr 192.168.35.225>]
sent [IPCP ConfReq id=0x2 <compress VJ 0f 01> <addr 192.168.35.225>]
rcvd [IPCP ConfAck id=0x2 <compress VJ 0f 01> <addr 192.168.35.225>]
local  IP address 192.168.35.225
remote IP address 195.5.50.34
Script /etc/ppp/ip-up started (pid 5906)
Script /etc/ppp/ip-up finished (pid 5906), status = 0x0
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x16 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x16 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x17 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x17 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x18 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x18 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x19 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x19 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x1a <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x1a <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x1b <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x1b <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x1c <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x1c <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfReq id=0x1d <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [CCP ConfAck id=0x1d <deflate 15> <deflate(old#) 15> <bsd v1 15>]
rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Received bad configure-ack:  1a 04 78 00 18 04 78 00 15 03 2f
Terminating on signal 2
Connect time 0.5 minutes.
Sent 280 bytes, received 240 bytes.
Script /etc/ppp/ip-down started (pid 5930)
sent [LCP TermReq id=0x2 "User request"]
rcvd [LCP TermAck id=0x2]
Connection terminated.
Waiting for 1 child processes...
  script /etc/ppp/ip-down, pid 5930
Script /etc/ppp/ip-down finished (pid 5930), status = 0x0