I'm hoping some of the Linux network experts can help me with this problem.
Situation: I have a technology which is a WebLogic JEE application that communicates to an Oracle database. Everything is installed in a single Linux virtual machine running in VirtualBox. Traffic from the JEE application goes via JDBC over TCP to the local running database. What I want to do is test a new database firewall server that wants all traffic destined for the database to flow via another virtual machine running the DB Firewall software.So therefore want I need to do is have DB traffic forced out over one interface only to return on another interface on the same VM listening on a different address.
JEE application running in WebLogic bound to 192.168.111.12 (eth1 a VirtualBox hostonly interface). Makes a request for 10.0.111.12 (eth2 a VirtualBox internal interface) which the database is listening on. Because both IPs are on local interfaces, Linux is going to handle the traffic and not route the 10.x traffic via the 192.x interface.I also have running the database firewall server which has a bridge (br0) between the HostOnly network and the Internal network.Both systems are running Oracle Enterprise Linux R5U4, which is basically the same as RedHat.What I want to do is have the request for 10.0.111.12 forced out via 192.168.111.12, bridged over the br0 connection and back into 10.0.111.12 and to the database. My networking knowledge is pretty good, but i'm stuck right now on the right way to do this. I'm pretty sure it is possible, I just need clear advice.
Reason for setup: Ideally I would build the system with the database on a separate machine so that I can easily route the traffic. Unfortunately we have many VirtualBox based demonstration systems with both the application and database installed on the same VM and therefore the amount of work to migrate these two dual VMs is going to be significant, also many of these VMs are demonstrated from laptops which have limited resources and creating a new database VM reduces overall performance. If I can create a way to force the traffic in this manner off and back onto the same VM via the other VM bridge, it would be fantastic.
I am trying to configure my android phone (rooted Eris running kaossfroyo 2.2) to be used as a midi controller. Which I am having enough trouble with as it is but it has raised an annoying issue that occurred a month ago when I used the phones tethering network with my laptop. After connecting the laptop to the phones network (either tether, or an Ad-hoc network created using the network manager) I am unable to switch to other networks. In other words when I'm done with the phone-laptop connection I cannot connect my laptop to my home network! When I click on the other network connection I can see that it is attempting to connect in the upper right corner of the desktop (the network icon) but it will not make the connection.
What happens is that the network indicator will make the little circle graphic as if it is trying to connect but it never will display the other circle as green indicating that it has connected. but when I disconnect from the home network that is not connecting I will get a message underneath that will say that ad-hoc network disconnected! If I am switching from the android tether it will say Android-Tether disconnected etc. Even though when I click on network manager it shows that I am attempting to connect to the home network (labeled LIBERTY in my case) upon disconnection it shows the ad-hoc or tether connection being disconnected.
I am absolutely baffled by this! The issue persists even after deleting the ad-hoc connection from the wireless settings tab!!! I would speculate that for some reason the laptop is attempting to connect to the previous ad-hoc connection despite me wanting it to connect to LIBERTY. I am very confused and hope someone can lead me in the right direction.
I could use Wireless network. I could see several different networks in my range. Then suddenly the network stoppedworking, and I can no longer see any networks under "Wireless networks".The Wired networks works fine.I tried upgrading ubuntu, but nothing changed. Just to confirm, I rebooted the computer in Windows Vista (Dual boot) andconfirmed that Wireless worked fine there. No hardware problem then.The suggestions I have found on this and other forums suggest looking at the output from iwconfig and ifconfig. But since I'm a n00b at Ubuntu I don't know what to make of it.
This is the output: emil@emils:~$ iwconfig lo no wireless extensions.
I have an HP Compaq nx6235 Notebook, which was happily running Windows Vista Home Premium, until I finally got around to loading Linux openSUSE 11.1 from a DVD issued with a magazine last year. I now have a problem, because my Windows Vista has been wrapped up in the Linux partitioning system. I know it is located at dev/sda1 and that it is an HPFS/NTFS filetype, create a dual boot drive on my notebook, so that I can happily play with both systems. I am newbie, so the instructions should be as clear and simple as possible.
I am setting up a class using a vmWare ESX server. Because of security proceedures, the students are not allowed to connect directly to the internet. Because of file space, the are severated on 3 servers. I am trying to set up a server that connects to the internet and all 3 subnets that the students are on.
I have configure 4 virtual NICs 1 with DHCP connected to the internet. The other 3 goes to each student network. I can get 2 working at a time. 1 using the DHCP and 1 of the other networks. It seems to be order dependent. On the main server I can ping the local address. When I ping the students systems, I can reach 1 but not the other 2. I get a host unreachable message.
Is there a limitation to 2 NICS. If not, is there any magic incantation to run the 4 nics?
I have a small pc running fedora 8 with iptables and 2 network cards for routing/firewall and secondary DNS.For some time I've been alerted by the network guys that this machine was generating some alerts. The real network IP address keeps being assigned to the other interface, intended for LAN only (10.0.0.1/24).I've already changed the PC, installed a more recent operating system, replaced the 2 network cards and the problem persists. I have another pc running the same services (except DNS) in a very simillar way and no alert logs from that one.onder if it is some configuration issue on my startup firewall script.I've also installed arpwatch and I could confirm this IP and physical address issue:
Arpwatch output: hostname: my.host.name ip address: my.ip.address
I am writing a new lightweight Linux distibution mainly for educational purposes. I have a problem; it won't find any ethernet cards. I have tried enabling several things in the kernel config. What I would really like to know is how to enable some generic ethernet drivers and therefore networking. I would like to avoid having to use modules. I'm using kernel version 18.104.22.168.
we are using Red hat enterprise 5.4 for our internet connection with following ip's
eth0: 192.168.1.2 (local lan) eth1: 22.214.171.124 (static ip address for 1st isp) eth2: 192.168.100.149 (2nd isp modem connected with lan cable)
first isp i.e tata internet connected to the internet and working very well
now i want 2nd isp to work when the first isp goes down, i had configured all dns in the resolve.conf and squid.conf, when i switch off the 1st isp for checking that failover is working or not i cannot get internet packets from the second isp.
I want to provide dhcp in different NIC which are eth3 and eth2. eth2 has the IP address of 192.168.3.1 and eth3 has the IP address of 192.168.4.1. I want to provide dhcp to 192.168.3.0network and also for 192.168.4.0 network.All these are done in ubuntu server.
I installed slackware 13 successfully. The problem I found is: I have 2 lancard, one is built in, other is external. When I net config it brings up 1 lan card not other. When I again netconfig it brings other lancard and now not the 1st one this time. thats means it bringing up any of the 1 lancard at a time. how both lancard can be bring up.
I have two nic cards installed in a Lucid LTS server.
eth0 is static using address 192.168.0.235 gateway 192.168.0.1 netmask 255.255.255.0
I have my Qwest DSL modem port forwarding port 80 to 192.168.3.235 however this doesn't seem to work if I have both cards running. If I remove the second card (eth1) and reconfigure eth0 to use 192.168.3.235 I can port forward into my webserver.
I'm running 10.04 64 bit, and the Intel PRO/Wireless 5100 AGN does not work with n routers. I'd like to either upgrade the card, or buy a usb adapter, but I can't figure out which cards will work. I've searched[URL].. which lists supported wifi cards, but most of the info on that page is not relevant to lucid, and hasn't been updated at all this year. I saw elsewhere that any card with the atheros chipset will work, but what cards have this? Will all of them with this chipset work?
Got 4 onbards nics and would like to bond them into a single 4GB pipe. It is running a number of VM's. I can set up a link in my switch but I am stumped on ubuntu side. I think I have to make a file with entries but not sure where or how.
I'm looking for a cheap and stable wifi card that will work with Ubuntu 11.04. My Linksys WMP300N is creating a conflict with the native Broadcom driver (causing the system to freeze after light network traffic) and ndiswrappper isn't working for 64 bit Ubuntu.
Does anyone own a relatively cheap (less than $40USD) PCI card that works flawlessly, or close to flawlessly with 64bit Ubuntu 11.04? I need to get off of this 35ft ethernet cord. Cat5 + crossing top of stairs = problem in the future.
I'm developing an application to monitorize the network interfaces plugged in my PC. I know that wireless interfaces are listed in /proc/net/dev, but I don't know how to identify a cellular NIC.Is there any virtual file in /proc that shows the cellular NICs in the system? Could I identify different cellular NICs looking at /dev/tty?
I have installed CentOs 5.4 for Snort sensor , on the location where i intend to place the Snort sensor to listen for internal firewall leg (LAN) the switch doesn't support port mirror so i would like to create with 2 nic's bridge and pass trough the firewall internal leg my question how do i set such configuration.
I have installed slackware 13.1 64-bit version and can not recognize network cards.I'm with laptop acer aspire 7540g.Wireless card is atheros ar5b93.Ethernet card is Broadcom NetLink � Gigabit Ethernet.
I have attached a diagram to show the layout, but basically I have a server that has 2 nics. I use NIC1 for the server and its services. Im using VirtualBox to run VMs and want to use NIC2 for the VMs exclusively and I want the VMs on a different network completely from the host.Ive tried setting up NIC2 on the other network but I end up with networking problems on network1. Also I cant figure out how to tell VirtualBox to bind to the host NIC2.
I don't have any background in networking. Could someone tell me what are the possible options and the best solution to join two networks together?Let's say network A has the IP address of 192.168.1.0/24 and network B has the IP address of 10.0.0.0/24. Should each end of the network has a gateway server? Or should I just setup one enough? Or do we have alternate options?
I just installed Fedora 13 on my desktop computer and ran into the same problems I did when I tried to install which was i could connect to a network but couldn't access the internet. I decided to install Fedora 14 since I already installed it on my laptop. I'm still running into the same issue, I can connect to my network but cannot connect to the internet using my PCI NIC or onboard NIC. Networking is enabled and I'm getting a IP address from my router. I ran "lspci" and it shows me both network cards which, please correct me if I'm wrong, makes me think that the drivers are installed.
I'm also curious if the VNC client/server could be used through a WAN. I would like to remote into my computer at home when I'm not there and see the gui. I had SSH installed at one point but it was just text. If there is better program please let me know. why I would have Services on my laptop but not on my desktop? Both computers are running the same version. Both cards are enabled and set to connect automatically. I can get a IP with both NICs. I only have one plugged in at a time.
Had a hard drive fail this week, and I am going to order a new one. I am using $150 dollars in Best Buy gift certificates. Well seeing as how I have some left over I would like to get a usb wireless adapter that would work out of the box (preferably usb although I could always get an internal). All Best Buy has are wireless N cards and I was wondering if anyone knows if any Wireless N USB cards work out of the box without downloading firmware or NDISwrapper.
I recently purchased two MSI Windtop AE2220's. One for my home which uses a router with WPA2 protection and one for my office where I use WEP encryption.
The Realtek internal wireless card will not connect to a WEP router if you are running Ubuntu Lucid Lynx 10.04. I have exhausted all suggestions on this site and all drivers found at Realtek's site.
I have been using Ubuntu since Hardy Heron, but sadly, painfully, I have had to install Windows 7 on my office machine until I find a wireless card compatible with the MSI Windtop AE2220, Lucid and WEP.
Do you know what's relationship between ethx and physical net cards? such as i have three net cards in the PC, named A, B, C. In which config file i could know that eth0 -> A, eth1 -> B, and eth2 -> C. Would the mapping relationship change after reboot? Is there any method i could change the mapping?