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wg-quick: document localhost exception and v6 rule 

Reported-by: Hermann Lienstromberg <nurtic-vibe@grmml.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2017-11-12 00:49:34 +09:00
parent e77a77a805
commit be4597e10f
1 changed files with 4 additions and 3 deletions
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7
src/wg-quick.8
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@ -137,9 +137,9 @@ Building on the last example, one might attempt the so-called ``kill-switch'', i
to prevent the flow of unencrypted packets through the non-WireGuard interfaces, by adding the following to prevent the flow of unencrypted packets through the non-WireGuard interfaces, by adding the following
two lines `PostUp` and `PreDown` lines to the `[Interface]` section: two lines `PostUp` and `PreDown` lines to the `[Interface]` section:
\fBPostUp = iptables -I OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -j REJECT\fP \fBPostUp = iptables -I OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -m addrtype ! --dst-type LOCAL -j REJECT\fP
.br .br
\fBPreDown = iptables -D OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -j REJECT\fP \fBPreDown = iptables -D OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -m addrtype ! --dst-type LOCAL -j REJECT\fP
.br .br
The `PostUp' and `PreDown' fields have been added to specify an The `PostUp' and `PreDown' fields have been added to specify an
@ -148,7 +148,8 @@ command which, when used with interfaces that have a peer that specifies 0.0.0.0
`AllowedIPs', works together with wg-quick's fwmark usage in order to drop all packets that `AllowedIPs', works together with wg-quick's fwmark usage in order to drop all packets that
are either not coming out of the tunnel encrypted or not going through the tunnel itself. (Note are either not coming out of the tunnel encrypted or not going through the tunnel itself. (Note
that this continues to allow most DHCP traffic through, since most DHCP clients make use of PF_PACKET that this continues to allow most DHCP traffic through, since most DHCP clients make use of PF_PACKET
sockets, which bypass Netfilter.) sockets, which bypass Netfilter.) When IPv6 is in use, additional similar lines could be added using
.BR ip6tables (8).
Or, perhaps it is desirable to store private keys in encrypted form, such as through use of Or, perhaps it is desirable to store private keys in encrypted form, such as through use of
.BR pass (1): .BR pass (1):