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New Member

Problem with CISCO 871


Hope I'm in right place to ask..

We have LAN, CISCO 871,  XP Clients, etc

also, VPN is used on CISCO device.

If user connects via CISCO, internet  speed is about 0.3-0.4 Mbit (via

If directly connects  to provider cable (DSL) - 10 Mb and more...

What shoud be checked ?

As usually - provider says that all is OK with him and this is VPN issue...

And VPN admin says - this is ISP failure,,

This is reslult of   >sh int Fa0 command on CISCO : (see file attached)

FastEthernet0 is up, line protocol  is up

Hardware is Fast Ethernet

MTU 1500 bytes BW 100000 Kbit DLY 100 usec

reliability 255/255  txload 2/255  rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100 Mb/s

ARP type: ARPA   ARP Tymeout 04:00:00

Last input never, output never, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0   Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40

May be problem with 1500 MTU ? Or Full duplex, ? etc..

New Member

Problem with CISCO 871


i think your are not in the right place.

so i will try to help, so you mean that everytime when user use the vpn client the speed is low ?

you say 0.5 MB of bandwidth  drom 10 MB, so how you test the bandwidth

New Member

Problem with CISCO 871


just go to - and see the results...

I did 2 tests -

1. When connected direcly from laptop to ISP cable in server room - upload/download is 10 Mb and more..

2. If  connect ISP cable to CISCO (like it should be), connect laptop to cisco out - speed is 0.3 - 0.2 Mb on same laptop (again in speedtest)

I found that problem somewhere in routing probably cause  when make tracert  in VPN, some VPN IP's hase very huge latency..But the problem is to find where it's

New Member

Re: Problem with CISCO 871

Can you confirm that there isn't a device or devices on the LAN that is running p2p software or something similar?

Sent from Cisco Technical Support iPad App

New Member

Problem with CISCO 871

ok andrey i see

so first of all, let us monitor the bandwith passing through the cisco router, because the speed test that you did is not efficient it shows the aproximative line bandwith and not the real download bandwith so if you are using a 10 MB symetric line the download speed it will be 1MB.

to monitor the bandwith you need to setup snmp on the router and use a monitoring tool, for the monitoring too i recommand you ti use PRTG is free up to 10 sensors i think and easy to use .

the line to add on the router is :

conf t

snmp-server community public ro

then if you can make us a copy past of your router  configuration, dont forget to hide public ip   adress and cisco secrets

New Member

Problem with CISCO 871

Hi Andrey,

Can you please tell me what is the use of VPN in your organization.??

Did users are experiencing slow internet performance?

Internet is slow when the VPN is conencted,right?

Please update.



Thanks and Regards, Vipin
New Member

Problem with CISCO 871

yes, correct.

Internet is slow ONLY inside VPN (behind CISCO)

New Member

Problem with CISCO 871


Where is this VPN connects to? to brach?

is a site-to-site VPN is used for VPN services?? or VPN client is used to conenct?



Thanks and Regards, Vipin

Problem with CISCO 871

Hi Hi Andrey,

There are many aspects regarding this...

What is the resouces load on your 871 router like cpu?
What is the overall utilization on your internet link?
Do you see any in put errors on the interface to which you connected your laptop?

As told by others will not give you accurate.
Try to use "iperf" a toold to test the bandwidth.

Please rate the helpfull posts.

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