用ADSL接入的CL用户进来看，关于MTU

DreamCat

还有一个问题，就是MSS的设置，rc.pppoe内设置成1500，无论我修改成什么值，只要访问internet，立刻就断线了。什么原因呢？

bow

在家用ADSL拨号路由ROUTEROS做2级NATSpeedGuide.net TCP/IP Analyzer

QUOTE
TCP properties for IP = 218.27.37.178 ()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 = 020405ac01010402 MTU = 1492 MTU is optimized for PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput. MSS = 1452MSS is optimized for PPPoE DSL broadband. If not, consider raising MTU to 1500 for maximum throughput. 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: 511104 (MSS x 44 * scale factor of 8)255552 (MSS x 44 * scale factor of 4)127776 (MSS x 44 * scale factor of 2) 63888 (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 = 106 hopsTTL value is ok. Timestamps (RFC1323) = OFF Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000

DreamCat

看来只有CL存在问题哦，好在已经解决了。免费版就是差点哦。：（

czw1240

改了的确快了一点不过不是很明显

DreamCat

我没有修改MTU，还是那个1500。我这里速度提升的比较明显，但不是太大，我再改改看。SG的下载页提供了不少的优化软件和补丁，建议使用。

btdownloader

TCP properties for IP = 221.227.147.207 ()Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)Notes: Read the Analyzer FAQ if the above is not your IP address. TCP options string = 02040550010303020101080a000000000000000001010402 MTU = 1400 MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. MSS = 1360MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value. Default Receive Window (RWIN) = 255680 RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)Unscaled Receive Window = 63920 RWIN is a multiple of MSSOther values for RWIN that might work well with your current MTU/MSS: 522240 (MSS x 48 * scale factor of 8)261120 (MSS x 48 * scale factor of 4)130560 (MSS x 48 * scale factor of 2) 65280 (MSS x 48)  bandwidth * delay product (Note this is not a speed test):Your RcvWindow limits you to: 10227.2 kbps (1278.4 KBytes/s) @ 200msYour RcvWindow limits you to: 4090.88 kbps (511.36 KBytes/s) @ 500ms MTU Discovery (RFC1191) = ON Time to live left = 117 hopsTTL value is ok. Timestamps (RFC1323) = Timestamps (RFC1323) = ONNote: Timestamps add 12 bytes to the TCP header of each packet, reducing the space available for useful data. Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000

btdownloader

唉，试了两次，结果还是差不多郁闷着呢   

QUOTE
TCP properties for IP = 221.227.147.207 ()Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)Notes: Read the Analyzer FAQ if the above is not your IP address. TCP options string = 02040550010303020101080a000000000000000001010402 MTU = 1400 MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. MSS = 1360MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value. Default Receive Window (RWIN) = 255680 RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)Unscaled Receive Window = 63920 RWIN is a multiple of MSSOther values for RWIN that might work well with your current MTU/MSS: 522240 (MSS x 48 * scale factor of 8)261120 (MSS x 48 * scale factor of 4)130560 (MSS x 48 * scale factor of 2) 65280 (MSS x 48)  bandwidth * delay product (Note this is not a speed test):Your RcvWindow limits you to: 10227.2 kbps (1278.4 KBytes/s) @ 200msYour RcvWindow limits you to: 4090.88 kbps (511.36 KBytes/s) @ 500ms MTU Discovery (RFC1191) = ON Time to live left = 117 hopsTTL value is ok. Timestamps (RFC1323) = Timestamps (RFC1323) = ONNote: Timestamps add 12 bytes to the TCP header of each packet, reducing the space available for useful data. Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000

DreamCat

CL ？先改下吧。下个版本会更正的。

DreamCat

MTU不用改，或者选择你合适的值。MSS改成1452，或者用（你选择的值 - 40）你仔细看前面的每个帖子~~

DreamCat

嗯，MSS 还是不改的好。关键就是不知道为什么 CL设成了1500