What does http://speedtester.bt.com say for the XP computer?

In reply to a post by Tipper2772:

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2012.02.23 15:51
IP address: 46.208.xx.xxx
Client OS/browser: Windows XP (Firefox 6.0.2)

TCP options string: 020405ac0103030401010402
MSS: 1452
MTU: 1492
TCP Window: 1027840 (NOT multiple of MSS)
RWIN Scaling: 4 bits (2^4=16)
Unscaled RWIN : 64240
Recommended RWINs: 63888, 127776, 255552, 511104, 1022208
BDP limit (200ms): 41114kbps (5139KBytes/s)
BDP limit (500ms): 16445kbps (2056KBytes/s)
MTU Discovery: ON
TTL: 52
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)


these are the results of the analyzer

BDP limit (500ms): 16445kbps (2056KBytes/s)

This figure seems to be the speed that it is capped at!.. can I change this manually?

In reply to a post by BatBoy:

What does http://speedtester.bt.com say for the XP computer?

it giving me speeds of 11mbps (max is 38) traffic managment?

earlier it was 33 using the thinkbroadband meter! (on the w7 pc) (16 on Xp)

Edited by Tipper2772 (Thu 23-Feb-12 21:18:02)

You could try swapping the network cables between the 2 PCs?

In reply to a post by BatBoy:

You could try swapping the network cables between the 2 PCs?

I only have one network cable.. I usually run the laptop (w7) wirelessly I tried it in both to test lan connection already. (thats when I realised that I was actually recieving over 30mbps from plusnet)

lol

In reply to a post by Anonymous:

BDP limit (500ms): 16445kbps (2056KBytes/s)
This figure seems to be the speed that it is capped at!.. can I change this manually?

You don't need to! That's not a limiting factor. It's for a round trip of 500ms, a long way away! You've also got:

BDP limit (200ms): 41114kbps (5139KBytes/s)

for a round trip of 200ms, nearer, but nowhere as near as the speedtesters you use.

I've got identical figures on my XP and I get speedtests of 18 Meg on my ADSL2+ line:

TCP options string = 020405ac0103030401010402

MTU = 1492
MTU is optimized for PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.

MSS = 1452
MSS is optimized for PPPoE DSL broadband. If not, consider raising your MTU value.

Default TCP Receive Window (RWIN) = 1027840
RWIN Scaling (RFC1323) = 4 bits (scale factor: 2^4=16)
Unscaled TCP Receive Window = 64240

For optimum performance, consider changing RWIN to a multiple of MSS.
Other RWIN values that might work well with your current MTU/MSS:
63888 (up to 2 Mbit lines, depending on latency. MSS * 44)
127776 (1-5 Mbit lines, depending on latency. MSS * 44 * 2)
255552 (2-14 Mbit lines, depending on latency. MSS * 44 * 2^2)
511104 (8-30 Mbit lines, depending on latency. MSS * 44 * 2^3)
1022208 (25-60 Mbit lines depending on latency. MSS * 44 * 2^4)

bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 41114 kbps (5139 KBytes/s) @ 200ms
Your TCP Window limits you to: 16445 kbps (2056 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 48 hops
TTL value is ok.

Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349) = 00000000 (0)

In reply to a post by XRaySpeX:

In reply to a post by Anonymous:

BDP limit (500ms): 16445kbps (2056KBytes/s)
This figure seems to be the speed that it is capped at!.. can I change this manually?

You don't need to! That's not a limiting factor. It's for a round trip of 500ms, a long way away! You've also got:

BDP limit (200ms): 41114kbps (5139KBytes/s)

for a round trip of 200ms, nearer, but nowhere as near as the speedtesters you use.

I've got identical figures on my XP and I get speedtests of 18 Meg on my ADSL2+ line:

TCP options string = 020405ac0103030401010402

MTU = 1492
MTU is optimized for PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.

MSS = 1452
MSS is optimized for PPPoE DSL broadband. If not, consider raising your MTU value.

Default TCP Receive Window (RWIN) = 1027840
RWIN Scaling (RFC1323) = 4 bits (scale factor: 2^4=16)
Unscaled TCP Receive Window = 64240

For optimum performance, consider changing RWIN to a multiple of MSS.
Other RWIN values that might work well with your current MTU/MSS:
63888 (up to 2 Mbit lines, depending on latency. MSS * 44)
127776 (1-5 Mbit lines, depending on latency. MSS * 44 * 2)
255552 (2-14 Mbit lines, depending on latency. MSS * 44 * 2^2)
511104 (8-30 Mbit lines, depending on latency. MSS * 44 * 2^3)
1022208 (25-60 Mbit lines depending on latency. MSS * 44 * 2^4)

bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 41114 kbps (5139 KBytes/s) @ 200ms
Your TCP Window limits you to: 16445 kbps (2056 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 48 hops
TTL value is ok.

Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349) = 00000000 (0)

Thanks for the info

Been trawling the web most of the night trying to figure it out Would an older network card "Realtek RTL8139/810x Family Fast Ethernet NIC" be compatable with fiber speeds - I can't seem to find much info about it??? Anyone?)

In reply to a post by Tipper2772:

Been trawling the web most of the night trying to figure it out Would an older network card "Realtek RTL8139/810x Family Fast Ethernet NIC" be compatable with fiber speeds - I can't seem to find much info about it??? Anyone?)

Should be fine. That's a 10/100Mbps interface card.

Take a look at the LEDs available on it - if it has one marked 100M then make sure it becomes lit on plugging in the cable (otherwise it is handshaking at 10Mbps).

If you have problems with it, it may be worth tracking down an updated driver. Shouldn't be necessary though.

Try disabling your Anti-virus protection while doing a speed test.