OpenSUSE Network :: Enable JUMBO Frames On A Tiny Subnet For NFS To Work?
Sep 27, 2010
I was able to build a NFS server and a NFS client using OpenSuse 11.3 and connect them together using gigabit ethernet through a switch. These are the only 2 devices on this net (192.168.1.xx). I tried to set the MTU to 9000 and 9014 but learned that the Realtek 8169/8111 only support up to about 7200 MTU. So I inserted Intel NIC cards on both and set both to 9000. The system accepts this and I can ssh from one machine to the other. Both NFS client and server start w/o issue and the client mounts the device just fine. But when I try to copy a file on the NFS client from the local disk to the server, the client just hangs and I have to physically turn the machine off in order to get it to work. Both systems are using the stock software from the DVD (I didn't update either).
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May 13, 2011
How do you set the MTU on the network card for Jumbo Frames? The MTU drop drown only goes to 1500 which is far from the Jumbo frame rate of 9000. If I type 9000 in will it blow anything up?
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Mar 28, 2010
finding out if jumbo frames are supported by linux or not?
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Sep 8, 2010
With Mellanox 10G NICs and the MTUs set from 1600 to 9000 we have tcp sessions hanging. Executing ls during an sftp session just hangs. The same thing happens for an ssh session, if execute ls I might get few item in the directory but then the session hangs. Like wise for FTP. The Fujitsu switch is configured by default to handle jumbo frames. At 1500 MTU everything works fine. We are running the 2.6.25.14 kernel with CentOS 5.2 and the Mellanox driver.
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Oct 18, 2010
I am looking for a PCI Ethernet adapter which supports jumbo frames. The card I have now - Trendnet TEG_PCITXR - says it supports jumbo frames but it turns out the MTU is 7200 bytes. Yeah this is more than 1500, but it seems like a bit of a scam to me. Since it is nearly impossible to find these specs on product info pages, I was hoping someone could recommend a network card that is proven to support 9000 (or greater) MTU. Some more info, I am running Ubuntu 9.04, kernel 2.6.28-19
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Feb 27, 2010
I have a machine running the 32-bit version of openSUSE 11.2 that can't seem to get outside the subnet (TCP/IP works properly inside the subnet). I've researched this problem, and I just can't seem to solve it.
The machine originally had 2 LAN cards in it. I failed to remove it before the install of openSUSE. One card was an old Network Everywhere, and the other was a 3Com 3c905c card. I decided to keep the 3com in, as I've good luck with this particular card when it comes to Linux. I've since removed the other, not only from the machine itself, but also from YaST ('Network Settings').
I can't see much in /var/logs. I've sifted through them several times. I don't see anything that really stands out. I've tried switching network control from ifup to network manager and back. That didn't seem to help. I've tried a static IP configuration and that doesn't seem to help either. I've also removed Avahi just to make sure my variables here are kept to a minimum (I don't use Avahi anyway, so it doesn't hurt).
The network is a 10.0.0.0/24 subnet with a default gateway of 10.0.0.1 (NAT). I have only 2 other PCs on this subnet - a Windows XP Pro machine, and a dual-booting laptop (XP / openSUSE 11.2). Both of them work fine. The gateway is a Linksys WRT54G router that I've flashed with DD-WRT (latest stable version). It handles DHCP for my small subnet. I have not made any changes to the network configuration / setup in a long, long time.
[Code]....
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Dec 26, 2010
I have been trying to get a DHCP PXE server up for a few days now, this is what I got so far..I am following this how-tohere are some outputs and what-nots, go to the last one to see the problem I am having.the host network
Code:
:~> /sbin/ifconfig
br0 Link encap:Ethernet HWaddr 00:19:DB:62:97:20
[code]....
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Mar 15, 2010
Step 1 : In Hyper-v Machine i have created two Virtual Ports.
Step 2 : Now for these two diff ports two ip address with different subnet mask(e.g 192.168.9.19 and 192.16.9.20)have been assigned(and have checked using ifconfig).
Step 3 : In Host machine i have added one subnetmask for one machine next one for another machine,however i m not able to ping both the ports from either of the machines having static ip 192.168.9.13 or having ip 192.16.9.107.
Step 4 : If i add same subnet mask for both machine it is pinging properly between 2 machines.
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Oct 16, 2010
I'd like to edit a few frames from some videos, and then return them to the video stream for playback. What are the best tools to do this with?
I tried exporting a frame with Kino, editing with GIMP, and then re-inserting it into Kino, but Kino rejected the attempt.
Will Kino do this, or do I need to be using something else?
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Oct 11, 2010
i want to connect two videos into one. let's take two videos from videos as an example. i want my final video to have the height = height of first video + height of second video and width = max(width of first video, width of second video). in the upper part the first video is played whereas in the lower part the second video is played.
do you know how to do it under linux, the best possibility while using mencoder, ffmpeg or any other command line command?
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Feb 27, 2010
I have been using Ubuntu for a while with no real issues. I have tried to do a fresh install of Kubutu but I cannot install it due to the fonts on the installation process being tiny. I am using a HDTV as my monitor so could this be the problem?? I have no other monitor to utilize so where do I go from here?
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Mar 5, 2010
How do I activate static DNS for mobile broadband. I can't find any place to write down this information. Settings are made in Network Manager - not Yast.
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Jan 13, 2010
Does anyone know how to permanently enable X connections from all machines on my local network. I keep having to enter 'xhost +' to allow X connections.
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Apr 4, 2010
I recently installed OpenSUSE 11.2 and everything works fine except wi-fi card, of course. The problem is that after installation the system recognized the card (is was listed in network devices in Yast) but I was unable to enable it through network-manager applet. Though the device could make scanning through terminal (found article in docs but didn't fully understand wpa_gui). Then i was stupid enough to delete the device from Yast list to try to reinstall it. So the problem is that i simply can't do this cause i see no way to re-detect. That is the goal is to at least turn back to post-install system state and try to enable wifi card again.
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Aug 9, 2010
I am using OpenSuse 11.3 and Network Manager is giving me a headache by not connecting to WEP based wi-fi network.It works in a wi-fi at my office while at my home, it shows / detects the network but keeps asking me over and over.
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Aug 16, 2011
My webcam won't work on Sites like omegle and tiny chat , yes i have downloaded chese but they still don't work how can i fix this ?
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Jul 22, 2011
I have TWO L3 + router switch (say switch1 and switch2). I created VLAN100 with VLAN ID 100 in both the switches. I created router 192.168.1.1/24 in Switch1. I created router 192.168.2.1/24 in Switch2. Switch1 is connected with 1.x/24 PCs. PCs are configured with 1.1 gateway. Switch2 is connected with 2.x/24 PCs. PCs are configured with 2.1 gateway. Both Switch1 and switch2 are connected by a trunk to carry VLAN100 data.
1)I have few PCs of 1.x connected to say Switch1 Is it possible for PC with IP 192.168.1.100(x) to ping PC with IP 192.168.2.100(y)?What are the configuration required in both switches to make them communicate ? All the device in both the subnets should ping/communicate with each other.
2)Move PC (192.168.1.100) to switch2. Move PC (192.168.2.100)to switch1.What will happen when PC(1.100) ping (2.100) and vice versa?What will happen when PC(say 1.80 in switch1) pings PC (say 1.100 in switch2) and vice versa? What will happen when PC(say 1.80 in switch1) pings PC (say 2.100 in switch1) and vice versa?
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Sep 15, 2010
Network Manager works for a while on Sony Vaio notebook and then it will become disable. Is there an easy way to enable it. I have installed 4 or 5 times to get it enabled. There must be a simpler way then reinstalling opensuse 11.3
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Jul 4, 2011
I installed Redhat Enterprise linux server5. it has two LAN card and two subnet connected to these two LAN card. i can browse network from these two network easily. But i created VLAN on one network card.Now i cant browse network from these VLAN subnet.
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Jul 8, 2011
My environment in a nutshell is like this:
- I'm a member of a Windows AD domain environment that spans many different subnets.
- My client workstation (Windows XP) is part of this domain and resides on one subnet.
- The server I'm trying to get Samba working on (SLES 10) is part of the same domain but resides on a different subnet.
- I want to access shares on the SLES 10 box from my workstation.
Here is what does work:
1. I can ping the workstation from the SLES box, both by hostname and ip.
2. I can ping the SLES box from my workstation, both by hostname and ip.
3. netstat -an shows that the SLES box is listening on ports 139 and 445.
4. I can telnet from my workstation to the SLES box on ports 139 and 445.
5. Output from smbclient -L coolserver (hostname obfuscated):
Code:
Anonymous login successful
Domain=[COOLDOMAIN] OS=[Unix] Server=[Samba 3.5.8-30.4-2516-SUSE-CODE10-x86_64] .....
Code:
Enter cooluser's password:
Domain=[COOLDOMAIN] OS=[Unix] Server=[Samba 3.5.8-30.4-2516-SUSE-CODE10-x86_64]
smb: >
So, cross-subnet communication seems to be working in a general sense and I have verified that my share is present and accessible by my chosen user id.
Here's what doesn't work (from the workstation):
1. Output from net view \coolserver:
Code:
System error 64 has occurred.
The specified network name is no longer available.
2. Output from net view \coolservercoolshare:
Code:
System error 5 has occurred.
Access is denied.
3. Same output as above if I try to connect via IP.
However, when I run any of the above commands from my workstation, I see the following in log.smbd on the SLES box:
Code:
coolworkstation (10.49.140.36) connect to service coolshare initially as user cooluser (uid=12171, gid=500) (pid 29039)
[2011/07/08 00:39:29.098422, 1] smbd/service.c:1251(close_cnum)
coolworkstation (10.49.140.36) closed connection to service coolshare
I'm not really sure how to interpret this because those are the exact same entries that get logged when I connect to the share locally, via the smbclient utility on the SLES box, which works fine... but from the Windows box I get the "Access is Denied" or "The specified network name is no longer available" errors. I also occasionally see this in log.smbd:
Code:
[2011/07/08 01:01:19.858308, 1] smbd/server.c:240(cleanup_timeout_fn)
Cleaning up brl and lock database after unclean shutdown
[2011/07/08 01:01:33.828692, 0] printing/print_cups.c:108(cups_connect)
Unable to connect to CUPS server localhost:631 - Connection refused
[2011/07/08 01:01:33.832127, 1] smbd/server.c:282(remove_child_pid)
Could not find child 29781 -- ignoring
I don't know if that is relevant. I created the Samba user via the smbpasswd utility and my smbusers file maps the system user directly to the Samba user, both of which have the same password. Here is my smb.conf:
Code:
[global]
workgroup = COOLDOMAIN
netbios name = coolserver
domain master = no
preferred master = yes
local master = yes
wins support = no .....
My workstation and the SLES box are both pointing to the same WINS server, which services the entire domain (which is also one of the DC's and one of the DNS servers). I'm really not sure what's going on. I'm guessing it probably has something to do with the subnet boundaries or the WINS configuration or something along those lines. I just don't understand because the smb daemon seems to be logging "successful" sessions from my workstation... but then the session just insta-closes.
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Jan 22, 2009
I am new to OpenSuse and want to exchange files wirelessly between Windows and Linux computers in our office. I run 11.1 Gnome on a 64-bit laptop. When I want to share a directory in my Home Folder, I get the message:
'net usershare' returned error 255: net userhare: usershares are currently disabled
So, how do I enable usershares in OpenSuse?
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Sep 13, 2010
I'm living at a friend's right now, and he's got a wireless access point in the house that I set my laptops wlan0 interface to route through the eth0 to my desktop. It's been working fine for internet sharing and internal networking ( ssh and ftp ) between the laptop and the desktop, but there's a problem with both subnets being able to communicate with each other, and I haven't been able to solve it with DNAT either.
The wireless access point is 192.168.0.1 and has its own lan on 192.168.0.0/24 of which my laptop is 192.168.0.5. I setup the little subnet I created by routing with the laptop to 192.168.1.0/24 and my desktop is 192.168.1.50. With shorewall I can configure iptables to DNAT all of my ssh traffic destined to 192.168.0.5 to 192.168.1.50, but the problem seems to occur when ssh on my desktop fails to connect rather than the DNAT failing.
Using iptraf I've seen that all of the routing does work properly, because I can see on the connection in iptraf that only the SYN packet is being sent from a 192.168.0.x address, there is no ACK packet sent back. I believe this is because in the connection dialog it always shows a 192.168.0.x ip as the source of the connection, but I don't have a route to 192.168.0.0/24 from 192.168.1.0/24 setup and I'm unsure of how to do so.
I'm pretty much in over my head because I don't know what is wrong, I thought it should work like this. Everything else from port configurations, to the configurations of the software itself seems fine so I don't think it's anything like that preventing a connection, but I can't think of what it would be aside from the lack of routing between each subnet.
Is there anyway to just add a route so that 192.168.1.0/24 and 192.168.0.0/24 can communicate with each other directly? I know there should be, I'm just not at all sure how it would be done.
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Feb 14, 2010
I am basically from system side and often confused about the calculation of the IP addresses.Just i want to know that what how can i calculate the following of a IP Address:
(1) Available IP in a Network
(2) Broadcast IP
(3) Network Prefix or Net Mask
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Sep 19, 2010
I have downloaded a film from a commercial TV station for my own use and want to edit out all the advertising breaks. I have tried Cinelerra but I cannot find a means of deleting selected frames, I also looked at trying to use Kdenlive but cannot find a way of loading the complete film to work on so unable to tell whether it might be useful.
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Mar 25, 2010
I have one server with 4 network interfaces:
eth0: 192.168.0.0/24 - local lan A
eth1: 200.1.2.3 - internet link - default route
eth2: 192.168.10.0/24 - local lan B eth3: 192.168.20.0/24 - local lan C
Lan A - Default routing to eth0
Lan B - Default routing to eth2
Lan c - Default routing to another server but the workstations has static routing to this server too.
Everything is working fine on Opensuse 11.1 until I upgrade this sever to Opensuse 11.2 ( Reinstall, not update at all ). After upgrade to 11.2 the routing across local lan interfaces simply not work, if you try to ping lan-to-lan you got the message: Network unreachable, even with the IP Forward enable, but the default route is working fine trough the SNAT.
I've come back to Opensuse 11.1 and everything become normal, does anyone have an problem like this? Maybe a bug? PS: I do not try to disable the AppArmor, next weekend I will try Opensuse 11.2 without the AppArmor and post here anyway.
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Jan 6, 2010
How can I enable the network with Networkmanager WIHTOUT logging in in OpenSuse 11.2?
If I define a connection for ethernet the System connection is greyed out. I want to use Networkmanager because I have also wireless connections...
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Mar 15, 2011
I am getting the error Cannot Enable Service SUSEFirewall2_setup when I try to set up the firewall in Yast.
11.4 x86-64
KDE 4.6.00
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Aug 27, 2009
I was having a discussion with someone who said that telnet, FTP, HTTP plain-text authentication in the local subnet is ok because it's a switched network. Also, that these protocols are not good over the net but in a local subnet they are just fine.
I know that someone can plug a hub in the network port and connect 2 (or more) PCs and see the packets. Also, heard about ettercap but haven't really delved into it. I know dsniff was written to prove the point that unencrypted protocols are bad. Would like to get opinion about unencrypted protocols over a switched networks.
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Aug 6, 2010
I will try to explain a bit first about my network typology: I have one cent os 5.5 machine with 2 nics - external one 86.x.x.122 and internal one with 2 IPs: 192.168.1.1 and 89.x.x.121. The ideea is that I have a public subnet (86.x.x.120/29) of IPs which are routable only through 86.x.x.122 so I have a webserver hosted on a different machine with the IP of 89.x.x.122 and GW 89.x.x.121 - everything works perfectly fine, except that I cannot access from the internal network 192.168.1.0 / 24 the so called DMZ (roughly) - the 89.x.x.122.
What really makes me crazy is that I setup the IPtables rules correctly because I can access the webserver from the outside world but I cannot accessit from the internal network...
what I'm missing - why the 192.168.1.0/24 cannot see the 89.x.x.122 machine... What IPtables rules should I add?
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Apr 12, 2010
I recently installed OpenSuse 11.2.How do I enable the IPX-protocol and login to a Netware 3.12 server?
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