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From 6d2ed7615614ede093f097189876d0f08553a43e Mon Sep 17 00:00:00 2001
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From: Reid Wahl <nrwahl@protonmail.com>
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Date: Mon, 14 Feb 2022 22:23:39 -0800
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Subject: [PATCH] IPsrcaddr: Add warning about DHCP
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If DHCP is enabled for the interface that serves OCF_RESKEY_ipaddress,
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then NetworkManager (and possibly dhclient in systems without NM;
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unsure) may later re-add a route that the IPsrcaddr resource replaced.
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This may cause the resource to fail or cause other unexpected behavior.
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So far this has been observed with a default route, albeit with an edge
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case of a configuration (OCF_RESKEY_ipaddress on a different subnet)
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that may not be totally valid. There are likely to be other situations
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as well where DHCP can cause conflicts with IPsrcaddr's manual updates
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via iproute. The safest option is to use only static configuration for
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the involved interface.
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Resolves: RHBZ#1654862
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Signed-off-by: Reid Wahl <nrwahl@protonmail.com>
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---
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heartbeat/IPsrcaddr | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/heartbeat/IPsrcaddr b/heartbeat/IPsrcaddr
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index ec868409f..fd7b6f68d 100755
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--- a/heartbeat/IPsrcaddr
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+++ b/heartbeat/IPsrcaddr
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@@ -99,6 +99,12 @@ meta_data() {
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<longdesc lang="en">
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Resource script for IPsrcaddr. It manages the preferred source address
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modification.
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+
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+Note: DHCP should not be enabled for the interface serving the preferred
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+source address. Enabling DHCP may result in unexpected behavior, such as
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+the automatic addition of duplicate or conflicting routes. This may
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+cause the IPsrcaddr resource to fail, or it may produce undesired
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+behavior while the resource continues to run.
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</longdesc>
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<shortdesc lang="en">Manages the preferred source address for outgoing IP packets</shortdesc>
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