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udhcpc works only with IPv4 addresses but the current /usr/share/udhcpc/default.script script interferes with IPv6. For example, when getting a new lease from an IPv4 address on a given interface, all the addresses on this interfaces get flushed, including IPv6. This issue has been reported to the busybox project: https://bugs.busybox.net/show_bug.cgi?id=9621 This commit prevents udhcpc to act on IPv6 addresses.
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