FTP上传速度非常慢的原因之一—-MTU值的设定

六月 17, 2009 作者:  
类别:最新博文, 软件使用

??????????????????????????????????????????????????????20K??????10??????????????????????????????????????????????????????????????????????FTP????????????????????????????????????????????????????????????????????????????????????????????????????????OK?~??FT~?WP??????????config?????????????????????????????????~~
?????????????????????????????????????????????????20K??????20????????????????????????????????1M?ADSL????????????????????????????????20K????????????????1K?????????????????????ADSL?????????????????????????????????????????????MTU?????????ADSL??????????1044?????????????????????????????????

?????????????MTU???????????????????MTU????1492 ???????????FTP???????????????????60?K?????

MTU??Maximum Transmission Unit?????TCP/IP?????????????????????MTU????????????? ?????MTU??????1500?????????????????????????4096????????????MTU????????

• 1500. ???Ethernet??????????????????????
• 1492. PPPoE ????
• 1472. ?? ping ???? ???????????????
• 1468. DHCP????
• 1430. VPN?PPTP ????
• 576. ?????ISP????

??????????????????????????MTU???????????ADSL???MTU??1044 ?????MTU????????????????????????????????????????????????MTU???????ping?????????“-f , healing
-l size”?????“-f ”???????????????????????????????“-l size”?????????????????????????????1500?ADSL??1492 ???????????????????
ping -f -l 1500 www.163.com
???

??????1500

??????1500

ping????“Packet needs to be fragmented but DF set”??MTU?????????????????????????????????
ping -f -l 1460 www.163.com
???

??????1460

??????1460

????MTU?????1460–1500?????????????????????????????????MTU???ping????????????????????28???????????????????????????????28 ?????1500????????????1528??????100M?Ethernet????????????????1472???1500??MTU???
ping -f -l 1472 www.163.com
???

??????1472

??????1472

?????????????MTU?????????????????????

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