Loopback when using PAP auth

Hi guys,

This is me... again :).

I was success connecting two machines, using a RAS machine for getting
modems, so I am using the socket option to connect to the RAS and get a
modem. There is no problem if I use noauth option in server and client
sides, but problems come when I try to use PAP auth.

Client must authenticate using PAP, so I have used this options in
server side: auth, require-pap. Client doesn't need server to auth
itself, so it is connecting using noauth option:

# server:
/usr/bin/pppd pppd debug notty 192.168.0.6:192.168.07 -detach escape
ff asyncmap 00002400

(/etc/ppp/options: lock nodefaultroute noproxyarp auth require-pap)

# client:
pppd socket cisco2:5014 -detach lock crtscts mtu 296 mru 296 connect
'chat -v -f /IBERCOM/usr/mgg327/ppp/chat-options' debug user EMI_TID_00
escape ff asyncmap 00002400 noauth

When client tries to connect, a "Serial line is looped back" is
received:

# pppd socket cisco2:5014 -detach lock crtscts mtu 296 mru 296 connect
'chat -v -f /IBERCOM/usr/mgg327/ppp/chat-options' debug user EMI_TID_00
escape ff asyncmap 00002400 noauth
Using /dev/pts/10; master fd 6, slave fd 7
pty speed set to 9600 bps
starting charshunt for socket option
connect option: 'chat -v -f /IBERCOM/usr/mgg327/ppp/chat-options'
started (pid 1908)
Serial connection established.
Using interface sppp0
Connect: sppp0 <--> /dev/pts/10
/etc/ppp/chap-secrets is apparently empty
sent [LCP ConfReq id=0x12 <mru 296> <asyncmap 0x2400> <magic
0x48ebf316> <pcomp> <accomp>]
sent [LCP ConfReq id=0x12 <mru 296> <asyncmap 0x2400> <magic
0x48ebf316> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x12 <mru 296> <asyncmap 0x2400> <magic
0x48ebf316> <pcomp> <accomp>]
sent [LCP ConfNak id=0x12 <magic 0x716808b6>]
rcvd [LCP ConfNak id=0x12 <magic 0x716808b6>]
sent [LCP ConfReq id=0x13 <mru 296> <asyncmap 0x2400> <magic
0x1dcdd5d0> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x13 <mru 296> <asyncmap 0x2400> <magic
0x1dcdd5d0> <pcomp> <accomp>]
sent [LCP ConfNak id=0x13 <magic 0x8d1a7b16>]
rcvd [LCP ConfNak id=0x13 <magic 0x8d1a7b16>]
sent [LCP ConfReq id=0x14 <mru 296> <asyncmap 0x2400> <magic
0x73d4f93a> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x14 <mru 296> <asyncmap 0x2400> <magic
0x73d4f93a> <pcomp> <accomp>]
sent [LCP ConfNak id=0x14 <magic 0x5db04e49>]
rcvd [LCP ConfNak id=0x14 <magic 0x5db04e49>]
sent [LCP ConfReq id=0x15 <mru 296> <asyncmap 0x2400> <magic
0x3fd5565d> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x15 <mru 296> <asyncmap 0x2400> <magic
0x3fd5565d> <pcomp> <accomp>]
sent [LCP ConfNak id=0x15 <magic 0x859ed4c0>]
rcvd [LCP ConfNak id=0x15 <magic 0x859ed4c0>]
sent [LCP ConfReq id=0x16 <mru 296> <asyncmap 0x2400> <magic
0xd9ea0b2c> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x16 <mru 296> <asyncmap 0x2400> <magic
0xd9ea0b2c> <pcomp> <accomp>]
sent [LCP ConfNak id=0x16 <magic 0x44eb36a9>]
rcvd [LCP ConfNak id=0x16 <magic 0x44eb36a9>]
sent [LCP ConfReq id=0x17 <mru 296> <asyncmap 0x2400> <magic
0xac0d2571> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x17 <mru 296> <asyncmap 0x2400> <magic
0xac0d2571> <pcomp> <accomp>]
sent [LCP ConfNak id=0x17 <magic 0x6bfc16a5>]
rcvd [LCP ConfNak id=0x17 <magic 0x6bfc16a5>]
sent [LCP ConfReq id=0x18 <mru 296> <asyncmap 0x2400> <magic
0xa112d86c> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x18 <mru 296> <asyncmap 0x2400> <magic
0xa112d86c> <pcomp> <accomp>]
sent [LCP ConfNak id=0x18 <magic 0xd6e17703>]
rcvd [LCP ConfNak id=0x18 <magic 0xd6e17703>]
sent [LCP ConfReq id=0x19 <mru 296> <asyncmap 0x2400> <magic
0x4976dbfe> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x19 <mru 296> <asyncmap 0x2400> <magic
0x4976dbfe> <pcomp> <accomp>]
sent [LCP ConfNak id=0x19 <magic 0xc101ca93>]
rcvd [LCP ConfNak id=0x19 <magic 0xc101ca93>]
sent [LCP ConfReq id=0x1a <mru 296> <asyncmap 0x2400> <magic
0xdedc0559> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1a <mru 296> <asyncmap 0x2400> <magic
0xdedc0559> <pcomp> <accomp>]
sent [LCP ConfNak id=0x1a <magic 0x5e5a3484>]
rcvd [LCP ConfNak id=0x1a <magic 0x5e5a3484>]
sent [LCP ConfReq id=0x1b <mru 296> <asyncmap 0x2400> <magic
0x4dc4fc90> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1b <mru 296> <asyncmap 0x2400> <magic
0x4dc4fc90> <pcomp> <accomp>]
sent [LCP ConfNak id=0x1b <magic 0xb5536cf4>]
rcvd [LCP ConfNak id=0x1b <magic 0xb5536cf4>]
Serial line is looped back.
sent [LCP TermReq id=0x1c "Loopback detected"]
rcvd [LCP TermReq id=0x1c "Loopback detected"]
sent [LCP TermAck id=0x1c]
rcvd [LCP TermAck id=0x1c]
Connection terminated.
Waiting for 1 child processes...
pid 1907: pppd (charshunt)
select
Child process pppd (charshunt) finished (pid 1907), status = 1

It seems that server side cannot talk ppp whit the client, or maybe it
is specting something and it is echoing all the messages it receives.
But when I use a 'noauth' in server side, all works fine. What can be
the problem?

# server pap-secrets file:
server CLIENT client_pass *

# client pap-secrets file:
CLIENT * client_pass *

Any help?
Thanks a lot!,

Mariano.

.

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