ADSL上不了Gmail？

drivel

奇怪了，我这里俩网络，一个是ADSL，一个是FTTB

如果Kubuntu用ADSL拨号上，打不开Gmail、论坛无法发帖、无法上传文件

如果用FTTB，一切却正常

用Windows XP连接ADSL，却一切正常

ssffzz1

TCPMSS

drivel

原帖由 ssffzz1 于 2007-8-23 06:47 发表
TCPMSS

麻烦您讲的清楚一点？

dzb_01

man iptables

/TCPMSS

   TCPMSS
       This target allows to alter the MSS value of TCP SYN packets, to control the maximum size for  that  connection
       (usually limiting it to your outgoing interface's MTU minus 40).  Of course, it can only be used in conjunction
       with -p tcp.  It is only valid in the mangle table.
       This target is used to overcome criminally braindead ISPs or servers  which  block  ICMP  Fragmentation  Needed
       packets.   The  symptoms  of  this  problem are that everything works fine from your Linux firewall/router, but
       machines behind it can never exchange large packets:
        1) Web browsers connect, then hang with no data received.
        2) Small mail works fine, but large emails hang.
        3) ssh works fine, but scp hangs after initial handshaking.
       Workaround: activate this option and add a rule to your firewall configuration like:
        iptables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
                    -j TCPMSS --clamp-mss-to-pmtu

       --set-mss value
              Explicitly set MSS option to specified value.

       --clamp-mss-to-pmtu
              Automatically clamp MSS value to (path_MTU - 40).

       These options are mutually exclusive.

drivel

原帖由 dzb_01 于 2007-8-23 13:55 发表
man iptables

/TCPMSS

   TCPMSS
       This target allows to alter the MSS value of TCP SYN packets, to control the maximum size for  that  connection
       (usually limiting it to your o ...

谢谢，但是，这和我的问题，有什么联系嘛？

drivel

哦，对了，MSS在pppoeconf的时候，好像就被限制了