/etc/network/if-up.d/uml-utilities is in uml-utilities 20070815.1-2build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
test -n "${IF_UML_PROXY_ARP}" || exit 0
test -n "${IF_UML_PROXY_ETHER}" || exit 0
sysctl -w net/ipv4/conf/"${IFACE}"/proxy_arp=1
for i in ${IF_UML_PROXY_ARP};
do
route add -host "$i" dev "${IFACE}"
arp -Ds "$i" "${IF_UML_PROXY_ETHER}" pub
done
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