Re: nd6_setmtu0: new link MTU on iwn0 (576) is too small for IPv6 which needs 1280

[Ottavio Caruso <ottavio2006-netbsd%yahoo.com@localhost>]

On 4 December 2014 at 13:29, Greg Troxel <gdt%ir.bbn.com@localhost> wrote:
>
> Ottavio Caruso <ottavio2006-netbsd%yahoo.com@localhost> writes:
>
>> On 4 December 2014 at 11:54, Joerg Sonnenberger <joerg%britannica.bec.de@localhost> wrote:
>>> On Tue, Dec 02, 2014 at 10:21:58PM +0100, Ottavio Caruso wrote:
>>>> I have a problem with wireless connection and Netbsd that I don't have
>>>> with Windows 7 and Linux.
>>>
>>> Do you run dhcpcd?
>>
>> Yes, I do and have done for a while. However I have only had this
>> problem since I have moved.
>
> try turning it off.  Then see if wpa_gui still provokes the mtu change.
>

It is indeed dhcpcd that sets mtu to 576:
dhcpcd[502]: iwn0: adding IP address 192.168.1.108/24
dhcpcd[502]: iwn0: adding route to 192.168.1.0/24
dhcpcd[502]: iwn0: adding default route via 192.168.1.1
dhcpcd[502]: iwn0: writing lease `/var/db/dhcpcd-iwn0.lease'
dhcpcd[502]: iwn0: executing `/libexec/dhcpcd-run-hooks', reason BOUND
dhcpcd[991]: iwn0: iwn0: MTU set to 576
dhcpcd[502]: forking to background
dhcpcd[502]: forked to background, child pid 889

Switching to dhclient fixes the problem.