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Date:      Thu, 31 Jul 2008 01:43:11 -0700
From:      perryh@pluto.rain.com
To:        keramida@freebsd.org
Cc:        freebsd-questions@freebsd.org
Subject:   Re: setting the other end's TCP segment size
Message-ID:  <48917b1f.54tmBJTmI4AmAR7E%perryh@pluto.rain.com>
In-Reply-To: <874p67xxlz.fsf@kobe.laptop>
References:  <488fe865.x7NyNic2A5pcZPCL%perryh@pluto.rain.com> <87ljzkdm3x.fsf@kobe.laptop> <87hca8dlh3.fsf@kobe.laptop> <489013b9.Pt7%2B7kznBXs3SSP%2B%perryh@pluto.rain.com> <874p67xxlz.fsf@kobe.laptop>

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> You can edit `/etc/hostname.foo0' in the Sun too, and add
> something like:
>
>     192.168.1.10/24 mtu 640

[getting OT for FreeBSD]

Are you sure that works as far back as SunOS 4.1.1?

/etc/hostname.le0 currently consists of the single word

  pluto

and it looks as if this causes /etc/rc.boot to do

  ifconfig le0 pluto netmask + -trailers up

(where the name pluto resolves to 192.168.200.1 via /etc/hosts).
If I were to change /etc/hostname.le0 to

  pluto mtu 640

I think the ifconfig command would become

  ifconfig le0 pluto mtu 640 netmask + -trailers up

and it doesn't look as if ifconfig recognizes mtu as a keyword
(at least while running -- granted I haven't tried actually
editing /etc/hostname.le0 and rebooting):

  # ifconfig le0 pluto mtu 640
  ifconfig: mtu: bad address



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