On the latest Debian 10, the `arptables-legacy` and `ebtables-legacy` binaries are not installed by default. Although the (non-legacy) versions are installed by default, it appears the respective packages that provide the legacy binaries must be installed in order to switch to the legacy alternatives. If you attempt to switch to the legacy alternatives without installing the `arptables` and `ebtables` packages, you will see an error: ``` update-alternatives: error: alternative /usr/sbin/arptables-legacy for arptables not registered; not setting ``` I have confirmed that the packages are present on Debian 10 and Ubuntu 19.10 and they provide the legacy alternatives. See: * https://packages.ubuntu.com/eoan/amd64/iptables/filelist * https://packages.ubuntu.com/eoan/amd64/arptables/filelist * https://packages.ubuntu.com/eoan/amd64/ebtables/filelist * https://packages.debian.org/buster/amd64/iptables/filelist * https://packages.debian.org/buster/amd64/arptables/filelist * https://packages.debian.org/buster/amd64/ebtables/filelist |
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