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New Member

Out Of Band Modem configuration problems.

Hi

I am having a problem with Out Of Band on a Cisco 837 router using the Async and Virtual Aux running IOS 12.3(4)T2.

I have experimented with several configs however after extensive testing our work around is to remove AAA Authentication and reload the router without this. When AAA Authentication is present I am unable to dial in and establish a PPP session and receive Windows error 721. debug ppp neg and debug ppp auth provide absolutely no information when the dial in process is happening.

The AAA Authentication line is standard:

aaa authentication login default group tacacs+ local

With AAA Authentication, Authentication works fine when logging into the router in band.

I have also experimented with "aaa authentication ppp" to authenticate the Out Of Band dial in attempts however this also results in a 721 error on the Windows Client.

Async Interface config:

interface Async1

ip address 192.168.99.1 255.255.255.0

encapsulation ppp

async default routing

async mode dedicated

peer default ip address 192.168.99.2

ppp max-bad-auth 3

ppp authentication pap

Line Con0 config:

line con 0

exec-timeout 120 0

modem enable

transport preferred all

transport output all

stopbits 1

Line Aux0 config:

line aux 0

exec-timeout 0 0

modem Dialin

modem autoconfigure type blaster_v1

transport preferred all

transport input all

transport output all

stopbits 1

speed 115200

flowcontrol hardware

Modem string:

modemcap entry blaster_v1:MSC=&F&C1&D2S0=1H0&W

Today, I have tried this with same config on IOS 12.3(7) and it kills ADSL connectivity when I dial in.

Could anyone suggest what could be causing these problems?

Many thanks

Max...

1 REPLY
New Member

Re: Out Of Band Modem configuration problems.

Hi

While further testing this I attempted to dial in and at the same time issued the "modem dialin" command under lin aux 0. Immediately the DTR set to 1 and DSR came up. If I hadn't have issued the "modem dialin" command (which was already present in the config), then PPP would not have completed. Does anyone have any ideas?

blaster_test#

blaster_test#config t

Enter configuration commands, one per line. End with CNTL/Z.

blaster_test(config)#line aux 0

blaster_test(config-line)#modem dialin

blaster_test(config-line)#

20:25:52: TTY1: Config change: asserting DTR

20:25:52: TTY1: Set DTR to 1

20:25:53: TTY1: restoring DTR

20:25:53: TTY1: Set DTR to 1^Z

blaster_test#

20:25:54: TTY1: DSR came up

20:25:54: TTY1: no timer type 1 to destroy

20:25:54: TTY1: no timer type 0 to destroy

20:25:54: TTY1: no timer type 2 to destroy

20:25:54: tty1: Modem: IDLE->(unknown)

20:25:54: As1 LCP: I CONFREQ [Closed] id 0 len 50

20:25:54: As1 LCP: ACCM 0x00000000 (0x020600000000)

20:25:54: As1 LCP: MagicNumber 0x05A539D3 (0x050605A539D3)

20:25:54: As1 LCP: PFC (0x0702)

20:25:54: As1 LCP: ACFC (0x0802)

20:25:54: As1 LCP: Callback 6 (0x0D0306)

20:25:54: As1 LCP: MRRU 1614 (0x1104064E)

20:25:54: As1 LCP: EndpointDisc 1 Local

20:25:54: As1 LCP: (0x1317018D2C29149824492EA46C09C681)

20:25:54: As1 LCP: (0x1579AE00000000)

20:25:54: As1 LCP: Lower layer not up, Fast Starting

20:25:54: As1 PPP: Using modem call direction

20:25:54: As1 PPP: Treating connection as a callin

20:25:54: As1 PPP: Phase is ESTABLISHING, Passive Open

20:25:54: As1 LCP: State is Listen

20:25:54: As1 PPP: Authorization NOT required

20:25:54: As1 LCP: O CONFREQ [Listen] id 5 len 24

20:25:54: As1 LCP: ACCM 0x000A0000 (0x0206000A0000)

20:25:54: As1 LCP: AuthProto PAP (0x0304C023)

20:25:54: As1 LCP: MagicNumber 0x0FA93C31 (0x05060FA93C31)

20:25:54: As1 LCP: PFC (0x0702)

20:25:54: As1 LCP: ACFC (0x0802)

20:25:54: As1 LCP: O CONFREJ [Listen] id 0 len 11

20:25:54: As1 LCP: Callback 6 (0x0D0306)

20:25:54: As1 LCP: MRRU 1614 (0x1104064E)

20:25:54: As1 LCP: I CONFREQ [REQsent] id 1 len 50

20:25:54: As1 LCP: ACCM 0x00000000 (0x020600000000)

20:25:54: As1 LCP: MagicNumber 0x05A539D3 (0x050605A539D3)

20:25:54: As1 LCP: PFC (0x0702)

20:25:54: As1 LCP: ACFC (0x0802)

20:25:54: As1 LCP: Callback 6 (0x0D0306)

20:25:54: As1 LCP: MRRU 1614 (0x1104064E)

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