[Mageia-discuss] Temporarily changing IP address

[Anne Wilson]

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On 22/05/12 17:12, Anne Wilson wrote:
> On 22/05/12 16:59, AL13N wrote:
>>> On 22/05/12 15:08, AL13N wrote:
>>>>>>> No :-(  No difference, even though I restarted the 
>>>>>>> network service,
>>>>> 
>>>>> Lets start from scratch.
>>>>> 
>>>>> But first, can you tell me the ip address of the NAS and 
>>>>> your laptop's IP address for eth0.
>>>>> 
>>>>> After making note of these, put the laptop back to it's 
>>>>> original config. (i.e. remove the manually created
>>>>> interface) and set wlan0 not to come up on reboot.  Then
>>>>> restart so you only have an ip address on eth0.
>>>>> 
>>>>> Then send me the info.
>>>>> 
>>>>> Doug
>>>> 
>>>> in fact, if we want it to be even simpler, you could add the 
>>>> ip address without a alias interface wit iproute2
>>>> 
>>>> []# ip addr show 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 inet6 
>>> fe80::1e75:8ff:fe28:bde4/64 scope link valid_lft forever 
>>> preferred_lft forever
>>> 
>>>> []# ip addr add www.xxx.yyy.zzz/netmask dev eth0
>>> 
>>> # ip addr add www.192.168.0.20/255.255.255.0 dev eth0 Error:
>>> an inet prefix is expected rather than 
>>> "www.192.168.0.20/255.255.255.0".
>>> 
>>> Not sure what it is expecting.
> 
>> hum, i meant the socalled CIDR notation: 4 parts of ip address 
>> followed by a subnet mask,
> 
>> in your case, i'd do:
> 
>> []# ip addr add 192.168.0.20/24 dev eth0
> 
> 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.
> 
>> then if you do
> 
>> []# ip addr show eth0
> 
>> again, you'd see it was there, as well as the extra route for
>> that range:
> 
>> []# ip route
> 
> # 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
> 
> 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
> 
>>> 
>>> Shorewall and iptables are currently stopped.
> 
>> Be careful of this, in your case, it might not matter, but 
>> shorewall stop has policy DROP, (i think), allthough iptables 
>> should have policy ACCEPT.
> 
>> so, you'd have to stop shorewall first, then stop iptables.
> 
> That's the order I did it.
> 
>> personally, i'd rather not stop the firewall, due to security 
>> reasons though. but since with this solution, you don't have any 
>> extra interface, even just restarting it would be fine.
> 
> Once I have a connection I'll restart them.
> 
>> if you want to debug even further:
> 
>> []# tcpdump -n -i eth0 host <nas_ip>
> 
> Where does that write to?  A log file?
> 
>> and try to connect and then you can see what sourceip and destip 
>> are set and if a reply is coming back.
> 
> 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
> 
Clearly it isn't.  Dolphin froze and wouldn't restart,then I lost half
of my display, so I shut down and gave it 30mins. rest, to make sure
that nothing was cached.  On reboot, it was back to 169.254.100.1.

I can go through the steps again, but how can I make it permanent?

Anne
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