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From 28be8992c3c1facfd80dfcc6afad951f33098783 Mon Sep 17 00:00:00 2001
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From: Gerd von Egidy <gerd.von.egidy@intra2net.com>
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Date: Thu, 5 Mar 2015 12:07:57 +0100
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Subject: [PATCH] Add support for ethernet point-to-point connections
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configured via DHCP
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When current dracut receives an ip with netmask of 255.255.255.255 via DHCP,
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setting the also supplied default gateway fails (because it is obviously not
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within the netmask).
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The setup with a netmask of /32 is quite common in colocation datacenters
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where you don't want the machines of two different customers to directly talk
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to each other. At least two of the biggest colocation providers in Germany
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(1&1 and Strato) do it that way. NetworkManager supports this kind of setup
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and the dhclient-scripts of several distributions too.
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In this patch I have implemented a simple approach very similar to what is
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found in Debian. The dhclient-script from Fedora uses a more sophisticated
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approach, but that relies on the ipcalc utility which would introduce a
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dependency on Fedora-initscripts for dracut.
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Signed-off-by: Gerd von Egidy <gerd.von.egidy@intra2net.com>
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(cherry picked from commit 99ccbc30dff9fa51dd3187dc10f8f632e5e54e4b)
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---
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modules.d/40network/dhclient-script.sh | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/modules.d/40network/dhclient-script.sh b/modules.d/40network/dhclient-script.sh
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index 7972af9..12e2869 100755
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--- a/modules.d/40network/dhclient-script.sh
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+++ b/modules.d/40network/dhclient-script.sh
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@@ -49,7 +49,13 @@ setup_interface() {
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${lease_time:+valid_lft $lease_time} \
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${preferred_lft:+preferred_lft ${preferred_lft}}
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- [ -n "$gw" ] && echo ip route replace default via $gw dev $netif > /tmp/net.$netif.gw
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+ if [ -n "$gw" ] ; then
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+ if [ "$mask" == "255.255.255.255" ] ; then
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+ # point-to-point connection => set explicit route to gateway
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+ echo ip route add $gw dev $netif > /tmp/net.$netif.gw
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+ fi
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+ echo ip route replace default via $gw dev $netif >> /tmp/net.$netif.gw
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+ fi
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[ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf
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if [ -n "$namesrv" ] ; then
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