Gentoo Archives: gentoo-user

From: Walter Dnes <waltdnes@××××××××.org>
To: gentoo-user@l.g.o
Subject: [gentoo-user] DNS from dialup or wifi for broadband connection?
Date: Sun, 12 Mar 2017 07:19:50
Message-Id: 20170312071859.GB10019@waltdnes.org
1 Starting a separate topic, rather than hijack the main thread...
2
3 On Fri, Mar 10, 2017 at 01:50:26PM -0600, Corbin Bird wrote
4 >
5 > 6 # : ISP is starting to filter customers web access. The ISP is
6 > deciding what sites customers are allowed to see. ( look up the
7 > practice called "ransom" ).
8
9 Does this consist of grabbing outbound traffic to port 53? If so, I
10 wonder if the following is possible...
11
12 * Can a POTS dialup or a wifi connection co-exist with a broadband
13 connection? It would make the network config and route config more
14 complex.
15
16 * If yes, can iptables be used to redirect only outbound-to-port-53
17 traffic to the dialup/wifi connection, with everything else going to
18 the broadband connection?
19
20 * Another option, if you know the alternate DNS server address in
21 advance, set up routing of the /32 (for the alternate DNS server)
22 to ppp0 or wlan0 with higher priority than the default route. This
23 doesn't require any iptables magic.
24
25 * Can the standard linux network stack handle this properly, and use
26 incoming DNS responses from the dialup/wifi connection for the IP
27 addresses of websites, etc to be accessed via broadband?
28
29 DNS traffic is low volume, usually fitting into 1 packet. So it
30 would be feasible to divert DNS requests to a lower-speed connection.
31 The broadband ISP would handle all the highspeed website, etc, traffic
32 but it would not see any DNS traffic, and would not be able to intercept
33 it.
34
35 --
36 Walter Dnes <waltdnes@××××××××.org>
37 I don't run "desktop environments"; I run useful applications

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