step-by-step ppp

[Alex Papadopoulos]

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Xairetw()

Edw kai arketo kairo kanw prospa8eies na kanw dialup se ena ISDN modem
pou exoume sth douleia. To problhma einai oti enw fainomenika syndeomai
kai pairnw IP (remote kai local gia to ppp0), den yparxei IP
connectivity. Telnet/ping/traceroute den paizoun.

Edw paw na kanw ping enan host pou kserw oti einai zwntanos, pisw apo to
modem pou exw synde8ei:

[root at helios log]# ping 192.168.1.20
PING 192.168.1.20 (192.168.1.20) from 192.168.1.1 : 56(84) bytes of
data.
- From 192.168.1.1: Destination Host Unreachable
- From 192.168.1.1: Destination Host Unreachable
- From 192.168.1.1: Destination Host Unreachable

- --- 192.168.1.20 ping statistics ---
4 packets transmitted, 0 packets received, +3 errors, 100% packet loss

...kai to antistoixo kommati apo to hmerologio katastrwmatos
(/var/log/messages):

May 30 01:46:45 helios pppd[4433]: pppd 2.4.1 started by root, uid 0
May 30 01:46:45 helios pppd[4433]: Using interface ppp0
May 30 01:46:45 helios pppd[4433]: Connect: ppp0 <--> /dev/ttyS1
May 30 01:46:47 helios pppd[4433]: local  IP address 192.168.0.1
May 30 01:46:47 helios pppd[4433]: remote IP address 192.168.1.1
May 30 01:47:08 helios pppd[4433]: Terminating on signal 15.
May 30 01:47:08 helios pppd[4433]: Connection terminated.
May 30 01:47:08 helios pppd[4433]: Connect time 0.4 minutes.
May 30 01:47:08 helios pppd[4433]: Sent 73 bytes, received 257 bytes.
May 30 01:47:08 helios pppd[4433]: Exit.

To oti mou dinei IP se allo subnet einai 8emito. To oti h remote IP pou
blepw einai h idia me thn IP pou exei to modem ayto (estw router) sto
eswteriko tou diktyo einai normal?

Parolo pou den yparxei connectivity, to link den peftei mono tou
(paliotera epairna meta apo ligo mhnymata la8ous kai h grammh epefte
monh ths).

Yparxei kapoios tropos na katalabw AKRIBWS ti prompts ktl stelnei ayto
to modem, wste na brw ti ftaiei?

Dokimasa to ekshs: Sto minicom esteila ta init tou modem mou, ola OK.
Stelnw ATDT0000000, mou bgazei to CONNECT 64000/38400 kai meta petaei
skoupidia. Tote apo ena shell ksekinaw xeirokinita ton pppd, kalwntas
kai to chat me to user kai to pass mou. Alla kai ayth h diadikasia den
dinei xrhsimes plhrofories gia to TI den paei kala kai den mporw na
synde8w... kammia idea gia kalytero troubleshooting?

TIA

- -A


PS: Xrhsimopoio RedHat 7.2, to netmod gia modem kai pairnw thl se enan 
Zyxel 100IH
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