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+ <H1>[Mageia-discuss] Temporarily changing IP address</H1>
+ <B>Maarten Vanraes</B>
+ <A HREF="mailto:mageia-discuss%40mageia.org?Subject=Re%3A%20%5BMageia-discuss%5D%20Temporarily%20changing%20IP%20address&In-Reply-To=%3Ce30a06cb2fbfa1d02fe8f11d31d27a23.squirrel%40mail.rmail.be%3E"
+ TITLE="[Mageia-discuss] Temporarily changing IP address">maarten.vanraes at gmail.com
+ </A><BR>
+ <I>Tue May 22 19:51:08 CEST 2012</I>
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+<PRE>&gt;<i> -----BEGIN PGP SIGNED MESSAGE-----
+</I>&gt;<i> Hash: SHA1
+</I>&gt;<i>
+</I>&gt;<i> On 22/05/12 16:59, AL13N wrote:
+</I>&gt;&gt;&gt;<i> On 22/05/12 15:08, AL13N wrote:
+</I>&gt;&gt;&gt;&gt;&gt;&gt;&gt;<i> No :-( No difference, even though I restarted the
+</I>&gt;&gt;&gt;&gt;&gt;&gt;&gt;<i> network service,
+</I>&gt;&gt;&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;&gt;<i> Lets start from scratch.
+</I>&gt;&gt;&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;&gt;<i> But first, can you tell me the ip address of the NAS and
+</I>&gt;&gt;&gt;&gt;&gt;<i> your laptop's IP address for eth0.
+</I>&gt;&gt;&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;&gt;<i> After making note of these, put the laptop back to it's
+</I>&gt;&gt;&gt;&gt;&gt;<i> original config. (i.e. remove the manually created interface)
+</I>&gt;&gt;&gt;&gt;&gt;<i> and set wlan0 not to come up on reboot. Then restart so you
+</I>&gt;&gt;&gt;&gt;&gt;<i> only have an ip address on eth0.
+</I>&gt;&gt;&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;&gt;<i> Then send me the info.
+</I>&gt;&gt;&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;&gt;<i> Doug
+</I>&gt;&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;<i> in fact, if we want it to be even simpler, you could add the
+</I>&gt;&gt;&gt;&gt;<i> ip address without a alias interface wit iproute2
+</I>&gt;&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;<i> []# ip addr show eth0
+</I>&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;<i> # ip addr show eth0 2: eth0: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt;
+</I>&gt;&gt;&gt;<i> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether
+</I>&gt;&gt;&gt;<i> 1c:75:08:28:bd:e4 brd ff:ff:ff:ff:ff:ff inet 169.254.100.1/24 brd
+</I>&gt;&gt;&gt;<i> 169.254.100.255 scope global eth0 inet6
+</I>&gt;&gt;&gt;<i> fe80::1e75:8ff:fe28:bde4/64 scope link valid_lft forever
+</I>&gt;&gt;&gt;<i> preferred_lft forever
+</I>&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;&gt;<i> []# ip addr add www.xxx.yyy.zzz/netmask dev eth0
+</I>&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;<i> # ip addr add www.192.168.0.20/255.255.255.0 dev eth0 Error: an
+</I>&gt;&gt;&gt;<i> inet prefix is expected rather than
+</I>&gt;&gt;&gt;<i> &quot;www.192.168.0.20/255.255.255.0&quot;.
+</I>&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;<i> Not sure what it is expecting.
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> hum, i meant the socalled CIDR notation: 4 parts of ip address
+</I>&gt;&gt;<i> followed by a subnet mask,
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> in your case, i'd do:
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> []# ip addr add 192.168.0.20/24 dev eth0
+</I>&gt;&gt;<i>
+</I>&gt;<i> Meanwhile, I played with alternatives, knowing that it must be
+</I>&gt;<i> something close to what I'd already tried. So,
+</I>&gt;<i>
+</I>&gt;<i> # ip addr add 192.168.0.20/255.255.255.0 dev eth0
+</I>&gt;<i> # ip addr show eth0
+</I>&gt;<i> 2: eth0: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1500 qdisc pfifo_fast
+</I>&gt;<i> state UP qlen 1000
+</I>&gt;<i> link/ether 1c:75:08:28:bd:e4 brd ff:ff:ff:ff:ff:ff
+</I>&gt;<i> inet 169.254.100.1/24 brd 169.254.100.255 scope global eth0
+</I>&gt;<i> inet 192.168.0.20/24 scope global eth0
+</I>&gt;<i> inet6 fe80::1e75:8ff:fe28:bde4/64 scope link
+</I>&gt;<i> valid_lft forever preferred_lft forever
+</I>&gt;<i>
+</I>&gt;<i> So now it appears to have two addresses, preferring the wrong one.
+</I>
+
+by preferring, you mean the top one?
+
+
+&gt;&gt;<i> then if you do
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> []# ip addr show eth0
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> again, you'd see it was there, as well as the extra route for that
+</I>&gt;&gt;<i> range:
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> []# ip route
+</I>&gt;&gt;<i>
+</I>&gt;<i> # ip route
+</I>&gt;<i> default via 192.168.0.1 dev eth1 proto static
+</I>&gt;<i> default via 169.254.100.100 dev eth0 metric 10
+</I>&gt;<i> default via 192.168.0.1 dev eth1 metric 10
+</I>&gt;<i> 169.254.100.0/24 dev eth0 proto kernel scope link src 169.254.100.1
+</I>&gt;<i> metric 10
+</I>&gt;<i> 192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.101
+</I>&gt;<i> 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.20
+</I>
+
+whoa, 3 default routes? over different interfaces...
+
+you have 192.168.0.0/24 network, both reachable over eth1 and eth0, i hope
+that is what you want...
+
+
+&gt;&gt;<i>
+</I>&gt;<i> ifconfig
+</I>&gt;<i> eth0 Link encap:Ethernet HWaddr 1C:75:08:28:BD:E4
+</I>&gt;<i> inet addr:169.254.100.1 Bcast:169.254.100.255
+</I>&gt;<i> Mask:255.255.255.0
+</I>&gt;<i>
+</I>&gt;&gt;&gt;<i>
+</I>&gt;&gt;&gt;<i> Shorewall and iptables are currently stopped.
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> Be careful of this, in your case, it might not matter, but
+</I>&gt;&gt;<i> shorewall stop has policy DROP, (i think), allthough iptables
+</I>&gt;&gt;<i> should have policy ACCEPT.
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> so, you'd have to stop shorewall first, then stop iptables.
+</I>&gt;<i>
+</I>&gt;<i> That's the order I did it.
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> personally, i'd rather not stop the firewall, due to security
+</I>&gt;&gt;<i> reasons though. but since with this solution, you don't have any
+</I>&gt;&gt;<i> extra interface, even just restarting it would be fine.
+</I>&gt;&gt;<i>
+</I>&gt;<i> Once I have a connection I'll restart them.
+</I>&gt;<i>
+</I>&gt;&gt;<i> if you want to debug even further:
+</I>&gt;&gt;<i>
+</I>&gt;&gt;<i> []# tcpdump -n -i eth0 host &lt;nas_ip&gt;
+</I>&gt;&gt;<i>
+</I>&gt;<i> Where does that write to? A log file?
+</I>&gt;<i>
+</I>&gt;&gt;<i> and try to connect and then you can see what sourceip and destip
+</I>&gt;&gt;<i> are set and if a reply is coming back.
+</I>&gt;&gt;<i>
+</I>&gt;<i> At the end of this, though, I can ping both the NAS on 192.168.0.200
+</I>&gt;<i> and other LAN connections.
+</I>&gt;<i>
+</I>&gt;<i> Last question, then, is whether this is a permanent change?
+</I>
+ip command is never permanent, you have to change the config files if you
+want permanent changes (ie: after reboot).
+</PRE>
+
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