PPP-over-Serial

PPP - kahe arvuti võrku ühendamine üle serial pordi

Kui kaks arvutit ühendada null modemi kaabliga serial porte pidi kokku, siis saab PPP protokolli kasutades tekida seda kanalit pidi IP ühenduse.

Näiteks Debian GNU/Linux 4.0 ja OpenBSD 4.2 puhul, kus Linuxi pool nö serveriks, on vajalikud sellise sisuga failid

Linux:

 bash# cat /etc/ppp/options
 lock
 bash# cat /etc/ppp/options.ttyS1
 115200
 xonxoff
 debug
 local
 10.1.0.254:10.1.0.251
 noauth

ning käivitamiseks öelda

 bash# pppd /dev/ttyS1 nodetach
 using channel 62
 Using interface ppp0
 Connect: ppp0 <--> /dev/ttyS1
 sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0xd6ef1575> <pcomp> <accomp>]
 sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0xd6ef1575> <pcomp> <accomp>]
 rcvd [LCP ConfReq id=0x1 <accomp> <pcomp> <asyncmap 0x0> <mru 1500> <magic 0x3ab01f30> <quality lqr 00 00 03 e8>]
 sent [LCP ConfRej id=0x1 <quality lqr 00 00 03 e8>]
 rcvd [LCP ConfAck id=0x1 <asyncmap 0xa0000> <magic 0xd6ef1575> <pcomp> <accomp>]
 rcvd [LCP ConfReq id=0x2 <accomp> <pcomp> <asyncmap 0x0> <mru 1500> <magic 0x3ab01f30>]
 sent [LCP ConfAck id=0x2 <accomp> <pcomp> <asyncmap 0x0> <mru 1500> <magic 0x3ab01f30>]
 sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
 sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 10.1.0.254>]
 rcvd [CCP ConfReq id=0x1 <predictor 1>]
 sent [CCP ConfRej id=0x1 <predictor 1>]
 rcvd [IPCP ConfReq id=0x1 <addr 10.0.1.254> <compress VJ 0f 01>]
 sent [IPCP ConfNak id=0x1 <addr 10.1.0.251>]
 rcvd [CCP ConfRej id=0x1 <deflate(old#) 15> <bsd v1 15>]
 sent [CCP ConfReq id=0x2 <deflate 15>]
 rcvd [IPCP ConfAck id=0x1 <compress VJ 0f 01> <addr 10.1.0.254>]
 rcvd [CCP ConfReq id=0x2]
 sent [CCP ConfAck id=0x2]
 rcvd [IPCP ConfReq id=0x2 <addr 10.1.0.251> <compress VJ 0f 01>]
 sent [IPCP ConfAck id=0x2 <addr 10.1.0.251> <compress VJ 0f 01>]
 local  IP address 10.1.0.254
 remote IP address 10.1.0.251
 Script /etc/ppp/ip-up started (pid 6632)
 rcvd [CCP ConfAck id=0x2 <deflate 15>]
 Deflate (15) receive compression enabled
 Script /etc/ppp/ip-up finished (pid 6632), status = 0x0

ja tekib seade

 bash# ifconfig ppp0
 ppp0      Link encap:Point-to-Point Protocol  
           inet addr:10.1.0.254  P-t-P:10.1.0.251  Mask:255.255.255.255
           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
           RX packets:9 errors:0 dropped:0 overruns:0 frame:0
           TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:3 
           RX bytes:245 (245.0 b)  TX bytes:243 (243.0 b)

OpenBSD poolel on kaks võimalust, kas ppp või pppd tarkvara abil. ppp puhul tuleb omada faili /etc/ppp/ppp.conf sisuga

 default:
  set device /dev/cua00
  set speed 115200
 
 direct-client:
  set timeout 900
  set lqrperiod 10
  disable ipv6cp
  disable deflate
  enable lqr
  accept lqr

Käivitamiseks tuleb öelda

 # ppp -foreground direct-client 
 Working in foreground mode
 Using interface: tun0

ja tekib seade

 # ifconfig tun0
 tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
       groups: tun
       inet 10.1.0.251 --> 10.1.0.254 netmask 0xffffffff

Praktiliselt sama tulemuse saavutamiseks pppd tarkvara abil tuleb omada faili /etc/ppp/options sisuga

 lock
 debug
 115200
 xonxoff
 local
 noauth

ja öelda

 # pppd /dev/cua00 nodetach
 (vt /var/log/daemon.log)

Kusjuures tekib seade

 # ifconfig ppp0   
 ppp0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
       groups: ppp
       inet 10.1.0.251 --> 10.1.0.254 netmask 0xffffff00