Sloved - Re: IPv6 mtu restriction

[Robert Moskowitz]

On 03/27/2014 12:50 PM, Robert Moskowitz wrote:
> This is from a Fedora 20 client testing to a Centos 6.5 server.
>
> I can do a ping6 with no problems, but I cannot 'ssh -6' to the server 
> (ssh -4 works).  I have reason to suspect the challenge is in my PPPoE 
> link with a restricted MTU size that v6's PMTU is not working right with.
>
> So my question is:  Is there a way to specify the MTU size for things 
> like ssh (and http) to use?

I was told that:

To figure out where I could put new MTU values:
“find /sys |grep mtu”

To set the MTU for my eth0, as root:
“echo 1300 > /sys/devices/pci0000:00/0000:00:03.0/0000:02:00.0/net/eth0/mtu”

"ifconfig eth0" reports an MTU of 1300 now.


And this works.  But it is not my problem.  Still not getting a TCP connection.  Going to have to check with wireshark.  Maybe it will help me...