On 03/27/2014 07:28 PM, Bill Davidsen wrote:
Robert Moskowitz wrote:
On 03/27/2014 03:40 PM, Rick Stevens wrote:
On 03/27/2014 09:50 AM, Robert Moskowitz issued this missive:
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?
The odds are that your PPoE stuff has problems with IPV6 addressing (as
many things do). I really doubt the MTU has anything to do with it
since MTU sets the maximum size of a packet and has nothing to do with
the addressing mechanisms. You could have a router that doesn't like
big packets, but that would affect both IPV4 and IPV6.
ping6 works in both directions no problem. Addressing is right. I
actually
have my own /48 allocation here.
It seems to be something with the firewall.
You can set the myu using the route command (or ip, if that's what you
know). The option is mss, used to set the payload size, when mtu
discovery doesn't work due to firewall. See 'man route' mss section
for some discussion.
AH, I was looking in the wrong man pages. Thanks. Need to know this
for the future.
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