jmvpnc at loplof
Jun 10, 2008, 6:22 PM
Post #2 of 2
(105 views)
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Re: Configure MTU on tunel device based on default device
[In reply to]
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Hello Tomas,
On Thu, Apr 03, 2008 at 10:27:23AM +0200, Tomas Mraz wrote:
> This patch modifies vpnc-script so it doesn't hardcode the MTU on tun
> device but computes it based on the MTU of the default route device
> instead. It will do this only when ip command is available otherwise
> stays with the hardcoded value.
...
> - ifconfig "$TUNDEV" inet "$INTERNAL_IP4_ADDRESS" $ifconfig_syntax_ptp "$INTERNAL_IP4_ADDRESS" netmask 255.255.255.255 mtu 1412 up
> + if [ -n "$IPROUTE" ]; then
> + DEV=$($IPROUTE route | grep ^default | sed 's/^.* dev \([[:alnum:]-]\+\).*$/\1/')
> + MTU=$(($($IPROUTE link "$DEV" | grep mtu | sed 's/^.* mtu \([[:digit:]]\+\).*$/\1/') - 88))
Hmm, I needed to change that into "ip link show "$DEV". Did you just miss the show
or has the syntax changed?
Also: I'm no specialist as far as shells are concerned, but it seems that these
lines contain some bash'isms that will fail with ordinary /bin/sh.
What do you think?
Thanks!
Joerg
--
Joerg Mayer <jmayer[at]loplof.de>
We are stuck with technology when what we really want is just stuff that
works. Some say that should read Microsoft instead of technology.
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vpnc-0.5.1-mtu.patch
