Problems with networkconnection

hi folks,

im new in using opensuse enterprise 11.2. On our old servers ubuntu was running. With the change of the hardware, it was necessary to get a linuxversion witch works with the raidsystem, witch ubuntu didnt.

Installation etc. works great, no problem there. After the configuration of the networksystem with yast, there should be connection to the internet or the local network, both didnt work. Other posts the first question is about the ifconfig and route, here it is:


eth0      Link encap:Ethernet  HWaddr 00:21:86:FA:1D:92
          inet addr:192.168.75.65  Bcast:192.168.75.255  Mask:255.255.255.0
          inet6 addr: fe80::221:86ff:fefa:1d92/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:286 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10
          RX bytes:0 (0.0 b)  TX bytes:84262 (82.2 Kb)
          Memory:fe400000-fe420000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:83 errors:0 dropped:0 overruns:0 frame:0
          TX packets:83 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5264 (5.1 Kb)  TX bytes:5264 (5.1 Kb)



Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.75.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         192.168.75.10   0.0.0.0         UG    0      0        0 eth0

This should not be a problem, but i dont understand why the connection cant be establish between the new server and the current environment. Do i need to start the hardware manuelly?

The dhcp is not used, because we use the name of this server for severall services, so its not an option, fyi i tried dhcp anyway, the result is the same.

Ping on 192.168.75.65 (the new server) is okay, ping on 192.168.75.10 (gateway) : imcp_seq=2 Destination Host Unreachable, the same for 192.168.75.50 (dns).

Hope someone can help me with my problem. Thanks ahead if you have read so far =)

greets from germany

First: Welcome to these forums (this being your first post).

Second, you say you have “opensuse enterprise 11.2”, which is a beast that does not exist. These Forums are about openSUSE and 11.2 is one of the supported levels. SUSE Linuc Exterprose Desktop/Server are different products, but I do not think they have the 11.2 version. So unless you state otherwise I assume you have openSUSE 11.2.

Then on to your problem.
Both the output of ifconfig -a and route look fine.

When you say “Ping on 192.168.75.65 (the new server) is okay”, do you mean you ping to your own system? That will always work because it is shortcut somewhere inside the TCP/IP stack.

Often network problems seem to go away when one switches off the use of IPv6. When you do not need it, this can be done in YaST > Network devices > Network configuration and then the Global options tab. Please try that.

On 05/07/10 17:16, hcvv wrote:
…]
> Often network problems seem to go away when one switches off the use of
> IPv6. When you do not need it, this can be done in YaST > Network
> devices > Network configuration and then the Global options tab. Please
> try that.

We (used to) tell Windows users that their solution of doing a reboot for
every problem was silly, but I think we now use the same kind of IPv6 ‘hammer’
for every Linux nail, bolt or screw or whatever else needs fixing…

For the OP: how do the network configurations look on the other hosts you
mentioned? Do they have the correct network mask and route back to your server?

Theo

First thanks for the fast responses!

Secound sorry about opensuse enterprise, my boss told me he has load the enterprise edition, i didnt ask more, now i see its just the dvd-version of opensuse :wink: my misstake, but still 11.2.

I allready deactivate the ip6stuff, it seems not nesessary for our system.

I also know that the ping on my own adress will allways succeed, but i tried some config with dhcp where the ping with the own adress didnt work.

@LittleRedRooster:
First i tried to reboot after major changes in the networkconfig the “windows-user-reboot”, still nothing worked the way its supposed to be, so i stoped rebooting after every change.

Ouw mainserver is a windows 2003 server, on dhcp i reserved the ip for the macadress of the new server, so the ip should get via dhcp or via the config in yast to the new one. The old ubuntuserver has the same config, gateway, dns. The ip is of course not the same ;).

I tried different cables, my last try is to change the actuall location into the serverroom, now the server is on my desk with my normal connection to the network.

Hope this may help you, to help me. Next try on the server is on monday, next businessday, so i wish you all a nice weekend!

Best regards!

edit: i forgott somethink, maybe its nothing but its came to my mind: in the networkconfig in yask, when i has entered the subnetmask of 255.255.255.0 and saved it, on the next time i opened the config, there was a “/24” in the subnetmaskfield. Does that means something or is this just a shortcut?

On 07/05/10 22:56, zerofs2001 wrote:
> @LittleRedRooster:
> Ouw mainserver is a windows 2003 server, on dhcp i reserved the ip for
> the macadress of the new server, so the ip should get via dhcp or via
> the config in yast to the new one. The old ubuntuserver has the same
> config, gateway, dns. The ip is of course not the same ;).

But are you sure the dhcp server serves the correct sub-net and gateway?

> edit: i forgott somethink, maybe its nothing but its came to my mind:
> in the networkconfig in yask, when i has entered the subnetmask of
> 255.255.255.0 and saved it, on the next time i opened the config, there
> was a “/24” in the subnetmaskfield. Does that means something or is this
> just a shortcut?

The CIDR notation of /bits is just another way of telling how many bits belong
to the network, and how many to the hosts. So is this case /24 means than 24
bits out of 32, i.e. 3 * 8, belong to the network, and 8 bits cover the
individual hosts on that network.
As 8 bits (2**8) == 255, it’s the same as saying 255.255.255.0 as netmask

Theo

Hey Theo,

i will check the subnetmask on monday, just to be sure!

Thanks for the info about the /24, didnt know thats a shortcut.

Best regards.

Did you have the gateway address configured?

It is not realy a shortcut (though it takes less characters)). Some tools/programs/configuration files use one notation, some use the other one, some can take both. So it is better to know about both of them.

I think it is in the routing table in the first post: 192.168.75.10

Hey guys,

i found the problem, it wasn’t the configuration, it was the network it self. I think it was something about our switch for my office, i changed the location of the server, now it works!

Thanks for all who tried to help me =)

Best regards.