Mailinglist Archive: opensuse (769 mails)

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Re: [opensuse] DHCPv6-PD request
  • From: Per Jessen <per@xxxxxxxxxxxx>
  • Date: Thu, 26 May 2016 16:37:47 +0200
  • Message-id: <ni71nr$crn$3@saturn.local.net>
Carlos E. R. wrote:

On 2016-05-26 14:26, Per Jessen wrote:
Carlos E. R. wrote:


But a rogue web server would know the address and run an attack on
it. Also, we can find the IP on mails.

What is a "rogue webserver" ?

A web server belonging to "bad guys", or hacked by them, that runs
code using the found IPs to attack them.

Ah I see. Well, same answer as before, IPv6 privacy extensions.

As for finding addresses in mails, they
are typically random. By default in openSUSE. See "IPv6 privacy
extensions".

But if you want to make use of things like VoIP you would need a fixed
address, non private, because you do want to do things needing being
accessible.

No, you don't need a fixed address for a VoIP client. With ISDN being
phased out by the end of next year, Swisscom will be switching everyone
to VoIP. None of those will need a fixed IP, v4 or v6. Deutsche
Telekom will be doing the same by the end of 2018.

Only if you want to run a server will you need fixed addresses, just
like now.

You get both type of addresses for a computer? How know applications
which one to use?

/proc/sys/net/ipv6/conf/eth0/use_tempaddr

0 = privacy extensions disabled.
1 = privacy extensions enabled, but not preferred.
2 = privacy extensions enabled, preferred.

A network interface will have

a) link local address - fe80:<mac-addr based>
b) a temporary address (assuming tempaddr!=0) = 2001:db8::random
c) an address handed out by dhcp = your:pref::pooladdr
d) a fixed address based on mac-addr = your:pref::macaddr-based.



--
Per Jessen, Zürich (23.4°C)
http://www.hostsuisse.com/ - virtual servers, made in Switzerland.

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