On Wed, Nov 25, 2009 at 09:34:30PM +0100, Guillaume CHARDIN wrote: > 2009/11/25 Alex Samad <alex@samad.com.au>: > > On Wed, Nov 25, 2009 at 08:03:52PM +0100, Guillaume CHARDIN wrote: > >> Hi, > > [snip] > > so when you browse from the linux computer running pppoe you have > > problems ? or only when you have a computer behind it. > > I don't have any graphical ui on the linux box but a `wget > website.domain` is endless. > > To fix mtu problem, i edit the /etc/ppp/peer/dsl-provider and modify the line : > mtu 1492 > to > mtu 1450 (i tried many value between 1450-1400) > the disconnect/reconnect. > I tried to set it to another value with the ifconfig command too. > > And I found on an internal windows station a max mtu size of 1463 > (with ping -l 1463 -f) > > For information, the MTU discovery is set on iptable on the debian gateway : > #iptables -t mangle -L > [...] > Chain FORWARD (policy ACCEPT) > target prot opt source destination > TCPMSS tcp -- anywhere anywhere tcp > flags:SYN,RST/SYN tcpmss match 1400:1536 TCPMSS clamp to PMTU Great thats about all the things I would have checked as well. you can test from linux itself with ping -M do -s <packet size> -c 10 <dest ip> I would try using the ping above to find the max mtu size to say your isp dns or proxy. then try it to the sites you can't always get to > > Thanks for your help -- "But all in all, it's been a fabulous year for Laura and me." - George W. Bush 12/20/2001 Washington, DC summing up his first year in office, three months after the 9/11 attacks
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