Router advertisement with MTU 1280

[hrsahu]

Hi all,

I have a FreeBSd FreeBSD machine which acts a IPv6 router and it is able to send Route Advertisements to different hosts. I have included route advertisement details to the /etc/route.conf. But I want to know how to send a route advertisement with an MTU size of 1280. I add MTU details to the rc.conf file for an interface.

ifconfig_re0_ipv6="inet6 2001:db8:ffff:2::201 prefixlen 64 mtu 1280"

And I also add the MTU value to /etc/rtadvd.conf:

re0:\
     :addr1="2001:db8:ffff:2::":prefixlen#64:mtu#1280:

but while checking with Wireshark, I can't see the route advertisement with MTU value. Could you please tell me how to transmit a Route Advertisement with an MTU value of 1280?

Regards

 

[bbzz]

Maybe because the MTU value is not carried in the packets. TCP MSS, on the other hand, is.

 

[hrsahu]

Hi all,

Could you please tell me how TCP MSS will help to transmit IPv6 route advertisement with a option field of MTU size?

Regards

 

[SirDice]

Have you tried setting it to auto in rtadvd.conf?