用ADSL接入的CL用户进来看，关于MTU

DreamCat

大家到这里看看，把你们自己的也发上来。

QUOTE
SpeedGuide.net TCP/IP AnalyzerTCP properties for IP = 221.8.141.34 ()Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)Notes: Read the Analyzer FAQ if the above is not your IP address. TCP options string = 0204058401010402 MTU = 1452 MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. MSS = 1412MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value. Default Receive Window (RWIN) = 16944 RWIN Scaling (RFC1323) = 0 bits Unscaled Receive Window = 16944 RWIN is a multiple of MSSOther values for RWIN that might work well with your current MTU/MSS: 519616 (MSS x 46 * scale factor of 8)259808 (MSS x 46 * scale factor of 4)129904 (MSS x 46 * scale factor of 2) 64952 (MSS x 46)?bandwidth * delay product (Note this is not a speed test):Your RcvWindow limits you to: 677.76 kbps (84.72 KBytes/s) @ 200msYour RcvWindow limits you to: 271.104 kbps (33.888 KBytes/s) @ 500msConsider increasing your RWIN value to optimize TCP/IP for broadband. MTU Discovery (RFC1191) = ON Time to live left = 106 hopsTTL value is ok. Timestamps (RFC1323) = OFF Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000

czw1240

TCP options string = 0204058401010402 MTU = 1452 MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. MSS = 1412MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value. Default Receive Window (RWIN) = 8472 RWIN Scaling (RFC1323) = 0 bits Unscaled Receive Window = 8472 RWIN is a multiple of MSSOther values for RWIN that might work well with your current MTU/MSS: 519616 (MSS x 46 * scale factor of 8)259808 (MSS x 46 * scale factor of 4)129904 (MSS x 46 * scale factor of 2) 64952 (MSS x 46)  bandwidth * delay product (Note this is not a speed test):Your RcvWindow limits you to: 338.88 kbps (42.36 KBytes/s) @ 200msYour RcvWindow limits you to: 135.552 kbps (16.944 KBytes/s) @ 500msConsider increasing your RWIN value to optimize TCP/IP for broadband. MTU Discovery (RFC1191) = ON Time to live left = 116 hopsTTL value is ok. Timestamps (RFC1323) = OFF Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000

czw1240

差不多

DreamCat

mtu 未优化？奇怪了。。

DreamCat

大家看这里：http://www.routerdesign.com/modules.php?na...tid=4&page=9#9a

QUOTE
Once you know the optimal MTU to use enter it into the CL machine. From the config menu go to "Network Settings -> Network Config". Find a line like the following..if [ "$USEPPPOE" != "YES" ] || ifconfig eth1 mtu 1500change "1500" to the optimal MTU, save, backup, and reboot!

czw1240

加大这么一点MTU值真的会快很多吗？会不会造成不稳定的？

DreamCat

我在弄呢。==

DreamCat

这有个工具，大家看看SG-TCPOptimizer我测试最大mtu的结果：

QUOTE
Pinging [63.217.30.70] with 40 bytes ->bytes=40 time=437ms TTL=48Pinging [63.217.30.70] with 750 bytes ->bytes=750 time=469ms TTL=48Pinging [63.217.30.70] with 1125 bytes ->bytes=1125 time=469ms TTL=48Pinging [63.217.30.70] with 1312 bytes ->bytes=1312 time=469ms TTL=48Pinging [63.217.30.70] with 1406 bytes ->bytes=1406 time=484ms TTL=48Pinging [63.217.30.70] with 1453 bytes ->bytes=1453 time=453ms TTL=48Pinging [63.217.30.70] with 1476 bytes -> ..fragmentedPinging [63.217.30.70] with 1465 bytes ->IcmpSendEcho(): 0

DreamCat

晕了，老大，有空给重新编译个busybox吧，ping 命令参数太少了 -f -l 都不让用

心想事成

好的，我已经试着编译过了busybox 1.0正式版本。coyote2.13是1.0 pre7，

DreamCat

经过一番测试，最优的MTU找到了：1480和这里列表中的WINDOWS XP的一样~~晚上改吧。

bow

我的没问题,是固定ip的adsl用BBI接入的Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)Notes: Read the Analyzer FAQ if the above is not your IP address. TCP options string = 020405b401010402 MTU = 1500 MTU is fully optimized for broadband. MSS = 1460Maximum useful data in each packet = 1460, which equals MSS. Default Receive Window (RWIN) = 65535 RWIN Scaling (RFC1323) = 0 bits Unscaled Receive Window = 65535 Note: Under Windows 9x, if you have RWIN set to any other value, and the Analyzer reports 65535 you might need to install the MS Vtcp386 fix.For optimum performance, consider changing RWIN to a multiple of MSS.Other values for RWIN that might work well with your current MTU/MSS: 513920 (MSS x 44 * scale factor of 8)256960 (MSS x 44 * scale factor of 4)128480 (MSS x 44 * scale factor of 2) 64240 (MSS x 44)  bandwidth * delay product (Note this is not a speed test):Your RcvWindow limits you to: 2621.4 kbps (327.675 KBytes/s) @ 200msYour RcvWindow limits you to: 1048.56 kbps (131.07 KBytes/s) @ 500ms MTU Discovery (RFC1191) = ON Time to live left = 108 hopsTTL value is ok. Timestamps (RFC1323) = OFF Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000