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New Member

Cisco 877 througput?

Hello,

Another wird problem. When i connect my cisco 877W to the internet (12 Mb down, 1 Mb up) i get different download results.

When i do a test (speedtest on the internet) connected to the cisco 877 LAN i get these results: max 650 kbps down and 101 kbps up.

When i am connected to the Wlan of the cisco 877 i get these results: max 375 bps down and 101 bps down.

And when i connect my Zyxel adsl2+ router i get : 1100 bps down and 101 bps up.

What's wrong with the Cisco ? Througput problem ?

Any suggestions ?

  • WAN Routing and Switching
13 REPLIES
Silver

Re: Cisco 877 througput?

What is your internet connection?ADSL?

Let me know,

Regards,

Silver

Re: Cisco 877 througput?

The router should able to support up to 30Mbps at 1400 byte.

What is your current IOS ver. ? Can you upgrade to 12.4(4)T ? It supports ADSL2/2+.

Check below for info.

http://www.cisco.com/en/US/products/hw/routers/ps380/products_qanda_item0900aecd8028a982.shtml

New Member

Re: Cisco 877 througput?

Hello,

I have adsl2+ and the current ios is 12.4.9T.

I also installed the 12.4.9.T1, but this ios image has given me problems with the WLAN.

Any suggestions ?

Silver

Re: Cisco 877 througput?

Can you try to download an older ver. (i.e. 12.4(6)T3 * 12.4(4)T4) to test again. If the problem still exists, I recommend to open a TAC case w/ Cisco for further investigation.

However, can you provide the config. for reference ?

Did you turn on any security, VPN service ?

Silver

Re: Cisco 877 througput?

Hello,

Will you please try to set the MTU size on the ethernet interface. Use the below command:

tcp-adjust mss 1350

Also, if you are using PPOE you have to set the MTU to 1492.

I guess the above should work and it is not an IOS problem. I had similar problem and it was due to MTU problem.

Please let me know how it goes,

Thanks,

Silver

Re: Cisco 877 througput?

Mohamand, thanks for the info. you wake me up for this reason. Let'w wait for the testing result. :)

John, more info. for you.

http://www.cisco.com/en/US/tech/tk870/tk877/tk880/technologies_tech_note09186a008011a218.shtml

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00804247fc.html

Hope this helps.

New Member

Re: Cisco 877 througput?

Okay, i will try this later on.

So i will set tcp-adjust mss 1350 on the ethernet interface.

I don't use pppoe so i will leave this to the default.

But what shall i put in the wlan ? Also tcp-adjust mss 1350 ?

Silver

Re: Cisco 877 througput?

According to the uage guidelines form second link. I could recommend below setting.

interface

ip tcp adjust-mss 1452

inteface

ip mtu 1492

Please advise the result after the test.

New Member

Re: Cisco 877 througput?

Hello Jack,

What value should i use for the wlan?

Later this day i will submit the results.

Thanks in advance.

John

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