ADSL2 Line Utilization causes ping to fail
Hi, I've got an ADSL2 Line with a CISCO 877 configured.
I started pinging certain IP addresses every minute to see if there's a network issue as sometimes there will be drop outs.
Meaning, the pings will fail for a good minute or so.
I called up the provider explaining this and they tell me that the network is over-utilized. CISCO Web admin shows that the line is 100% utilized.
The provider says that the uplink is causing the problem and is peaking at 650K (theoretically there should be like 1MBps uplink and 22MBps downlink) and unless I do something over at my end on the LAN, there's nothing much they can do.
Network is running 2 different subnet, VLAN-ed at the CISCO level, having 10 odd clients each. Each VLAN has 1 microsoft SBS server. One LAN runs Exchange Server as well as a POSTFIX linus mail server, altogether about 10 internal email accounts. External people access the Postfix machine via POP3 and IMAP, total of 30 odd accounts.
Question I've got is
1. How can I throttle bandwidth without investing too much $
2. Is this sort of network behaviour weird? Network should not drop the ping, instead the latency should be higher.
any suggestions much appreciated.
I started pinging certain IP addresses every minute to see if there's a network issue as sometimes there will be drop outs.
Meaning, the pings will fail for a good minute or so.
I called up the provider explaining this and they tell me that the network is over-utilized. CISCO Web admin shows that the line is 100% utilized.
The provider says that the uplink is causing the problem and is peaking at 650K (theoretically there should be like 1MBps uplink and 22MBps downlink) and unless I do something over at my end on the LAN, there's nothing much they can do.
Network is running 2 different subnet, VLAN-ed at the CISCO level, having 10 odd clients each. Each VLAN has 1 microsoft SBS server. One LAN runs Exchange Server as well as a POSTFIX linus mail server, altogether about 10 internal email accounts. External people access the Postfix machine via POP3 and IMAP, total of 30 odd accounts.
Question I've got is
1. How can I throttle bandwidth without investing too much $
2. Is this sort of network behaviour weird? Network should not drop the ping, instead the latency should be higher.
any suggestions much appreciated.
ASKER
Hi Blue-screen,
thanks for the info.
Have tried to understand what MQC is from the Cisco web site but it looks a bit too technical for me at the moment.
Would it be possible to guide me into doing this? The QOS module is not installed on my CISCO router it seems.
thanks for the info.
Have tried to understand what MQC is from the Cisco web site but it looks a bit too technical for me at the moment.
Would it be possible to guide me into doing this? The QOS module is not installed on my CISCO router it seems.
Do you have the web interface (SDM) installed? The web interface makes it easier.
ASKER
Yup. I mainly use the SDM to access it.
Was just reading up on how to install the QOS for my IOS software
Can you please advise how to go about doing this? I'm lost at CISCO web site.
thanks a million
Was just reading up on how to install the QOS for my IOS software
Can you please advise how to go about doing this? I'm lost at CISCO web site.
thanks a million
Maybe try
https://cisco.hosted.jivesoftware.com/docs/DOC-1574
In this case, what really mattes is the TOTAL BANDWIDTH, you can set voice and business critical to whatever. The traffic shaping, which is a side effect of setting QoS, is what you want.
Also a qiock summary of how to do it on the command line:
http://slaptijack.com/networking/easy-traffic-shaping-in-cisco-ios/
https://cisco.hosted.jivesoftware.com/docs/DOC-1574
In this case, what really mattes is the TOTAL BANDWIDTH, you can set voice and business critical to whatever. The traffic shaping, which is a side effect of setting QoS, is what you want.
Also a qiock summary of how to do it on the command line:
http://slaptijack.com/networking/easy-traffic-shaping-in-cisco-ios/
ASKER
Hi, thanks for the comment. I've taken a look at the video on line, looks pretty easy.
The QOS seems to be disabled on my router. Here's a couple of screenshots. Can you advise where I can get the QOS module
cisco1.png
cisco2.png
The QOS seems to be disabled on my router. Here's a couple of screenshots. Can you advise where I can get the QOS module
cisco1.png
cisco2.png
ASKER
Just got thru to the Cisco Feature Navigator for the required feature.
There's a lot of them. Can you advise how best to filter thru?
My router is a cisco 877-M
There's a lot of them. Can you advise how best to filter thru?
My router is a cisco 877-M
ASKER
Just so I don't overwrite everything and lose all the configurations during the upgrade ... thanks
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
Hi tried best to figure this out, there's too many combinations and I don't think I have a service contract. How best to approach this?
If you need software updates, a service contract is probably the best approach.
2) It is normal for pings to be lost on overutilized networks. Networks relieve congestion by dropping packets, and Ping packets get dropped like any other. You can control you link congestion with traffic shaping, but if the provider drops packets before they reach the core of the network you can only control that by buying a more expensive tier of service or picking a new ISP.
All ISPs oversubscribe their access links, from 10:1 to 100:1. If you are sharing a link with 3 or 4 dorks running bittorrent 24x7, your performance will suffer. Usually, "business class" service will get you into a better oversubscription tier, and away from the bottom dwellers that clog up consumer internet.