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<H1>[Mageia-discuss] Temporarily changing IP address</H1>
<B>Anne Wilson</B>
<A HREF="mailto:mageia-discuss%40mageia.org?Subject=Re%3A%20%5BMageia-discuss%5D%20Temporarily%20changing%20IP%20address&In-Reply-To=%3C4FBBBAD7.9020208%40kde.org%3E"
TITLE="[Mageia-discuss] Temporarily changing IP address">annew at kde.org
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<I>Tue May 22 18:12:07 CEST 2012</I>
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<PRE>-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 22/05/12 16:59, AL13N wrote:
>><i> On 22/05/12 15:08, AL13N wrote:
</I>>>>>>><i> No :-( No difference, even though I restarted the
</I>>>>>>><i> network service,
</I>>>>><i>
</I>>>>><i> Lets start from scratch.
</I>>>>><i>
</I>>>>><i> But first, can you tell me the ip address of the NAS and
</I>>>>><i> your laptop's IP address for eth0.
</I>>>>><i>
</I>>>>><i> After making note of these, put the laptop back to it's
</I>>>>><i> original config. (i.e. remove the manually created interface)
</I>>>>><i> and set wlan0 not to come up on reboot. Then restart so you
</I>>>>><i> only have an ip address on eth0.
</I>>>>><i>
</I>>>>><i> Then send me the info.
</I>>>>><i>
</I>>>>><i> Doug
</I>>>><i>
</I>>>><i> in fact, if we want it to be even simpler, you could add the
</I>>>><i> ip address without a alias interface wit iproute2
</I>>>><i>
</I>>>><i> []# ip addr show eth0
</I>>><i>
</I>>><i> # ip addr show eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP>
</I>>><i> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether
</I>>><i> 1c:75:08:28:bd:e4 brd ff:ff:ff:ff:ff:ff inet 169.254.100.1/24 brd
</I>>><i> 169.254.100.255 scope global eth0 inet6
</I>>><i> fe80::1e75:8ff:fe28:bde4/64 scope link valid_lft forever
</I>>><i> preferred_lft forever
</I>>><i>
</I>>>><i> []# ip addr add www.xxx.yyy.zzz/netmask dev eth0
</I>>><i>
</I>>><i> # ip addr add www.192.168.0.20/255.255.255.0 dev eth0 Error: an
</I>>><i> inet prefix is expected rather than
</I>>><i> "www.192.168.0.20/255.255.255.0".
</I>>><i>
</I>>><i> Not sure what it is expecting.
</I>><i>
</I>><i> hum, i meant the socalled CIDR notation: 4 parts of ip address
</I>><i> followed by a subnet mask,
</I>><i>
</I>><i> in your case, i'd do:
</I>><i>
</I>><i> []# ip addr add 192.168.0.20/24 dev eth0
</I>><i>
</I>Meanwhile, I played with alternatives, knowing that it must be
something close to what I'd already tried. So,
# ip addr add 192.168.0.20/255.255.255.0 dev eth0
# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP qlen 1000
link/ether 1c:75:08:28:bd:e4 brd ff:ff:ff:ff:ff:ff
inet 169.254.100.1/24 brd 169.254.100.255 scope global eth0
inet 192.168.0.20/24 scope global eth0
inet6 fe80::1e75:8ff:fe28:bde4/64 scope link
valid_lft forever preferred_lft forever
So now it appears to have two addresses, preferring the wrong one.
><i> then if you do
</I>><i>
</I>><i> []# ip addr show eth0
</I>><i>
</I>><i> again, you'd see it was there, as well as the extra route for that
</I>><i> range:
</I>><i>
</I>><i> []# ip route
</I>><i>
</I># ip route
default via 192.168.0.1 dev eth1 proto static
default via 169.254.100.100 dev eth0 metric 10
default via 192.168.0.1 dev eth1 metric 10
169.254.100.0/24 dev eth0 proto kernel scope link src 169.254.100.1
metric 10
192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.101
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.20
><i>
</I>ifconfig
eth0 Link encap:Ethernet HWaddr 1C:75:08:28:BD:E4
inet addr:169.254.100.1 Bcast:169.254.100.255
Mask:255.255.255.0
>><i>
</I>>><i> Shorewall and iptables are currently stopped.
</I>><i>
</I>><i> Be careful of this, in your case, it might not matter, but
</I>><i> shorewall stop has policy DROP, (i think), allthough iptables
</I>><i> should have policy ACCEPT.
</I>><i>
</I>><i> so, you'd have to stop shorewall first, then stop iptables.
</I>
That's the order I did it.
><i>
</I>><i> personally, i'd rather not stop the firewall, due to security
</I>><i> reasons though. but since with this solution, you don't have any
</I>><i> extra interface, even just restarting it would be fine.
</I>><i>
</I>Once I have a connection I'll restart them.
><i> if you want to debug even further:
</I>><i>
</I>><i> []# tcpdump -n -i eth0 host <nas_ip>
</I>><i>
</I>Where does that write to? A log file?
><i> and try to connect and then you can see what sourceip and destip
</I>><i> are set and if a reply is coming back.
</I>><i>
</I>At the end of this, though, I can ping both the NAS on 192.168.0.200
and other LAN connections.
Last question, then, is whether this is a permanent change?
Anne
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