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The preinit network initialisation and failsafe informational message are inherently racy as the interface takes some time to become functional after "ip link set $pi_ifname up" command. Consider this timing: [ 12.002713] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready [ 12.008819] IPv6: ADDRCONF(NETDEV_UP): eth1.1: link is not ready [ 12.118877] random: procd: uninitialized urandom read (4 bytes read) [ 13.068614] eth1: link up (1000Mbps/Full duplex) [ 13.073309] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready [ 13.080445] IPv6: ADDRCONF(NETDEV_CHANGE): eth1.1: link becomes ready Since the UDP message was sent prior to link becoming ready, it was never seen on the wire. The default failsafe timeout is set to 2 seconds, so with this patch there are two attempts to send the message, one spent in vain, and the other visible in tcpdump on an attached host. Of course, in cases when the interface is brought up faster it leads to two messages, however it should be harmless. This patch (almost) doesn't affect normal boot time while still allowing to enter failsafe reliably with a single button press, matching the official "generic failsafe" documentation. Signed-off-by: Paul Fertser <fercerpav@gmail.com>
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|__| W I R E L E S S F R E E D O M
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This is the buildsystem for the OpenWrt Linux distribution.
To build your own firmware you need a Linux, BSD or MacOSX system (case
sensitive filesystem required). Cygwin is unsupported because of the lack
of a case sensitive file system.
You need gcc, binutils, bzip2, flex, python3.5+, perl, make, find, grep, diff,
unzip, gawk, getopt, subversion, libz-dev and libc headers installed.
1. Run "./scripts/feeds update -a" to obtain all the latest package definitions
defined in feeds.conf / feeds.conf.default
2. Run "./scripts/feeds install -a" to install symlinks for all obtained
packages into package/feeds/
3. Run "make menuconfig" to select your preferred configuration for the
toolchain, target system & firmware packages.
4. Run "make" to build your firmware. This will download all sources, build
the cross-compile toolchain and then cross-compile the Linux kernel & all
chosen applications for your target system.
Sunshine!
Your OpenWrt Community
http://www.openwrt.org