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diff -up dhcp-4.2.5/client/dhclient.c.orig dhcp-4.2.5/client/dhclient.c
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--- dhcp-4.2.5/client/dhclient.c.orig 2018-11-07 14:21:16.756152614 +0100
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+++ dhcp-4.2.5/client/dhclient.c 2018-11-08 17:30:15.754440523 +0100
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@@ -1618,8 +1618,14 @@ void dhcpack (packet)
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} else
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client -> new -> renewal = 0;
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- /* If it wasn't specified by the server, calculate it. */
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- if (!client -> new -> renewal)
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+ /*
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+ * If it wasn't specified by the server, calculate it. Also use expiry
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+ * instead of renewal time when it is shorter. This better follows
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+ * RFC 2131 (section 4.4.5) when dealing with some DHCP servers.
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+ */
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+
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+ if (!client -> new -> renewal ||
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+ client -> new -> renewal > client -> new -> expiry)
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client -> new -> renewal = client -> new -> expiry / 2 + 1;
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if (client -> new -> renewal <= 0)
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@@ -1645,7 +1651,9 @@ void dhcpack (packet)
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} else
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client -> new -> rebind = 0;
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- if (client -> new -> rebind <= 0) {
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+ /* Rebinding time must not be longer than expiry. */
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+ if (client -> new -> rebind <= 0 ||
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+ client -> new -> rebind > client -> new -> expiry) {
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if (client -> new -> expiry <= TIME_MAX / 7)
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client -> new -> rebind =
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client -> new -> expiry * 7 / 8;
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