Hi, it seems that Microsoft Network is blocking the path MTU discovery (ICMP fragmentation required but df bit set). That is causing problems because some customers who happen to use GRE tunnels for their branch offices can't access MSMessenger of the Hotmail page. Is there somebody from MSN here? Is there a workaround for this problem without using other type of tunneling? If not, is there any other workaround? -- Miguel Mata-Cardona Intercom El Salvador mmata@intercom.com.sv voz: ++(503) 278-5068 fax: ++(503) 265-7024
On Mon, 17 May 2004, Miguel Mata-Cardona wrote:
Is there somebody from MSN here? Is there a workaround for this problem without using other type of tunneling? If not, is there any other workaround?
Use "ip mtu 1500" on each tunnel interface. Uses more CPU but works. "ip adjust-mss 1300" is also nice, in conjunction with the above you end up with the TCP traffic not being fragmented and it still being transparent for fullsize UDP traffic. -- Mikael Abrahamsson email: swmike@swm.pp.se
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Miguel Mata-Cardona -
Mikael Abrahamsson