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SG TCP/IP Analyzer

IP Address: (
Client OS: Search Bot
User Agent: CCBot/2.0 (
Please Read the Analyzer FAQ if the above is not your IP address.

TCP options string = 020405860103030801010402
MTU = 1454
MTU sometimes used in PPPoA applications. If not, consider increasing your MTU to 1500 for better throughput. If you are using a router, it could be limiting your MTU regardless of Registry settings.
MSS = 1414
Maximum useful data in each packet = 1414, which equals MSS.
Default TCP Receive Window (RWIN) = 65536
RWIN Scaling (RFC1323) = 8 bits (scale factor: 2^8=256)
Unscaled TCP Receive Window = 256

RWIN is not multiple of MSS. If your OS supports setting RWIN directly, consider changing it to a multiple of MSS for optimum performance.
Other RWIN values that might work well with your current MTU/MSS:
65044  (up to 2 Mbit lines, depending on latency. MSS * 46)
130088 (1-5 Mbit lines, depending on latency. MSS * 46 * 2)
260176 (2-15 Mbit lines, depending on latency. MSS * 46 * 2^2)
520352 (10-30 Mbit lines, depending on latency. MSS * 46 * 2^3)
1040704 (30-100 Mbit lines depending on latency. MSS * 46 * 2^4)

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

Your current TCP Window limits you to: 2621 kbps (328 KBytes/s) @ 200ms latency
Your current TCP Window limits you to: 1049 kbps (131 KBytes/s) @ 500ms latency
MTU Discovery (RFC1191) = ON
Time to live left = 110 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

Share Your Results

Below is a compact version of the results without specific recommendations, useful for sharing your current settings. Feel free to post in our forums with any questions you may have.

Note: Click in text area to highlight. Use CTRL+C to copy results, CTRL+V to paste them.


Optimize Your Connection

The TCP/IP Analyzer results provide packet header information from the TCP 3-way handshake between your computer and our server. The information above can be used to fine-tune TCP/IP settings and optimize your internet connection.
Detailed information on optimizing your network-related settings is available in our Broadband articles and TCP/IP Tweaks Articles.
We have also developed the free TCP Optimizer program to help apply the optimal settings automatically: SG TCP/IP Optimizer

Feel free to ask specific questions about your results in our forums.

80,441,930 connections tested since 2001.03.10
Analyzer version: 1.32 - last updated 2018.04.20

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