Am 07.03.25 um 16:31 schrieb Guido Trentalancia:
Nowadays FQDN hostnames are very often unavoidable, because in many
cases their IP addresses are allocated dynamically by the DNS...
which makes rules with hostnames even more dumb
frankly you can't write useful rules for dynamic IPs at all
The patch is very useful for a desktop computer which, for example,
connects to a wireless network only occasionally and not necessarily at
system bootup and which needs rules for IPs dynamically allocated to
FQDNs.
Guido
On Fri, 07/03/2025 at 15.48 +0100, Reindl Harald wrote:
Am 07.03.25 um 15:07 schrieb Jan Engelhardt:
On Friday 2025-03-07 14:42, Guido Trentalancia wrote:
libxtables: tolerate DNS lookup failures
Do not abort on DNS lookup failure, just skip the
rule and keep processing the rest of the rules.
This is particularly useful, for example, when
iptables-restore is called at system bootup
before the network is up and the DNS can be
reached.
Not a good idea. Given
-F INPUT
-P INPUT ACCEPT
-A INPUT -s evil.hacker.com -j REJECT
-A INPUT -j ACCEPT
if you skip the rule, you now have a questionable hole in your
security.
just don't use hostnames in stuff which is required to be upo
*before*
the network to work properly at all
