Speeds slow untill changing to half duplex

[liliggy]

As a telco company we recently stepped it up by offering cable modem service over our existing cable plant as well as DSL service. We are using the Terayon CMTS 3200 series.

Problem was we couldnt connect over a speed of 1.5mbs to our server and more then 300k out to the world. From the CMTS we are going straight into a Cisco 7200 series Router.

Speeds continued to be very slow so I tried bypassing the firewall. no help. Then out of desperation I limited the bandwidth to half duplex. And boom. speeds were over 10 meg to our server with no limitations and 6 meg out to the world limited by proxy. Any idea why changing from full duplex to hald duplex would make the system faster? Goes against all normal thinking.

Thanks

 

[bf0x]

Depends on both sides of the connection. If you have a mismatch it will cause errors and dropped packets, which in turn will cause latency and retransmits. By dropping your connection half duplex you more than likely matched the other side of the connection that was running half duplex. Try changing both sides to full duplex in your network and see if that speeds things up. But if your limited at the current speed then changing it would not help increase whats already maxed out. Hope this helps.

 

[jimbopalmer]

Auto can sync with Auto
Auto can sync with Half
Full can sync with Full
Half can sync with Auto
Half can sync with Half
but
Full never syncs with anything but Full.

So if you can only change one end of the wire from Auto, Auto and Half are the only safe choices. Only choose Full if you can change both ends of the wire.


I tried to remain child-like, all I acheived was childish.

 

[liliggy]

Both sides were turned up to full duplex.

I just now tried to connect them both set at auto. Connection good speeds bad. Went back to Half duplex and seems to be ok. Dropping a few more packets then I would like to see. Called Terayon they said to try to put a switch betweent the router and the cmts. Tried this no luck. Any other ideas??

Might be a while to respond having trouble with multilink to sprint. So thats the top priority .

Thanks in advance

 

[bf0x]

Have you tried setting them both to full? Just because both are set to auto does not gaurantee them to go to full but possibly both went to half. I have seen auto mess up more than once what the end result should be. Hard coding is always better if both ends allow it. What type of switch did you put in between the two? A management switch or a dumb switch? If you have a switch you can manage you can set the port to half or full.