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New Member

Compression 3640

I am using 3 BRI's and digital modem Module. when I dial in (using win2k pro laptop) I can never connect faster than 31.2kbps and detail properties of the connection show no compression even though it is on the dialup client.

The following is the config

interface Group-Async1

ip address x.x.x.x 255.255.0.0

ip helper-address x.x.x.x

ip directed-broadcast

ip nat inside

encapsulation ppp

ip tcp header-compression passive

async mode interactive

peer default ip address pool default

ppp authentication chap

group-range 65 70

What am I missing?

3 REPLIES

Re: Compression 3640

To raise the connecting speed of your modems, I would recommend that you upgrade your modem firmware.

We have 3640s running with a PRI and I am able to connect a win2k PC with the use of TCP headercompression. Your config resembles what we are running, execpt that we are using virtual interfaces.

Could be an IOS-issue.

Alltogether it would help in troubleshooting when we know what versions you are using. Could you provide the output of sh ver and of sh modem ver?

New Member

Re: Compression 3640

Here is the show ver

Cisco Internetwork Operating System Software

IOS (tm) 3600 Software (C3640-D-M), Version 12.0(7)XK1, EARLY DEPLOYMENT RELEASE

SOFTWARE (fc1)

TAC:Home:SW:IOS:Specials for info

Copyright (c) 1986-2000 by cisco Systems, Inc.

Compiled Thu 16-Mar-00 21:16 by phanguye

Image text-base: 0x600088F0, data-base: 0x609FA000

ROM: System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE SOFTWARE (f

c1)

ROM: 3600 Software (C3640-D-M), Version 12.0(7)XK1, EARLY DEPLOYMENT RELEASE SOF

TWARE (fc1)

newyork uptime is 27 weeks, 14 hours, 28 minutes

System returned to ROM by reload

System image file is "flash:c3640-d-mz-120-7.XK1"

cisco 3640 (R4700) processor (revision 0x00) with 27648K/5120K bytes of memory.

Processor board ID 21990196

R4700 CPU at 100Mhz, Implementation 33, Rev 1.0

MICA-6DM Firmware: CP ver 2310 - 6/3/1998, SP ver 2310 - 6/3/1998.

Bridging software.

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

and sh modem ver

newyork#sh modem ver

Slot 2:MICA-6DM Firmware, Source - IOS

CP ver 2310 - 6/3/1998, CheckSum B4585A04.

SP ver 2310 - 6/3/1998.

MICA 0: HW Version 2.1, Serial Number 21149683.

MICA 1: Not Installed.

MICA 2: Not Installed.

MICA 3: Not Installed.

MICA 4: Not Installed.

newyork#

Thanks for your assistance

Bronze

Re: Compression 3640

Note that the 3600 does not support V.90 speeds with 2310; you would need at least 2510; 2940 is the latest and supports V.92, but this will require an IOS upgrade too.

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/sw_conf/portware/56k36mtx.htm

As for compression, I'm not sure if you are referring to V.42bis or VJHC; if it's the former, certainly upgrading the modem code may be prudent. If it's the later, the IOS code could be an issue, although I would first suggest you have a look at "debug ppp neg" to see how header-compression is being negotiated.

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