CentOS 5 Networking :: When I Change Dom0's Firewall Setup, The DomU Will Fail To Connect To Internet?
May 17, 2010
I'm using virtual network (NAT network) for my domU.When I change dom0's firewall setup, the domU will fail to connect to Internet anymore.So far, the only way to bring the network back is reboot dom0 !I try to restart service network and libvirtd on dom0 ... it doesn't work.How can I bring the domU network back without reboot dom0 ?
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Aug 4, 2010
Problems with xen 3.1.2 creating and installing domU CentOS 5.5 I am trying to do a virt-install --prompt --paravirt, and the install error out while trying to download install RPMs. I have googled for xen centos virt-install and various permutations. I have found similar howtos for 5.4 and 5.3, but they resulted in the same outcome. I did find several posts with similar issues, but no solution was posted.[URL]..
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Feb 1, 2009
I'm running a CentOS 5.2 on dom0 and two CentOS 5.2 on domU.The domU use virbr0.I install domU via GUI interface and did not change anything ... the domUcan ping and connect to dom0 but can't access to Internet !!I search google and find someone mentioned that I need to enable IP forwardin dom0 ... I did but my domU still can't access to Internet.What else I need to do ?The routing table of dom0 is:
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
[code]....
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Mar 10, 2010
I have an etch-based Xen server that has several Xen domU's on it. All the domU's are etch or lenny based, but I'd like to install a karmic guest. I use xen-tools to install my domU's - e.g., xen-create-image --debootstrap <etc.>After much googling, I've found bits and pieces of info that have gotten me closer to the goal, but the debootstrap script I have is for hoary (I think etch came with this), and I'm pretty sure this won't work.
If you have been able to successfully install a Karmic guest on an etch or lenny host, I'd be very grateful for pointers.
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Aug 24, 2010
I have CentOS 5.5 distribution with Dom0 and DomU installed. I try to access Dom0 files during vsftpd server from DomU during ftp client. I successfully login with root and simple user, but when I try to list (or cd to some directory) in user home the SELinux prevent it from me. I get this in audit.log:
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Feb 4, 2010
Im trying to setup multiple domU through the default bridge setup. I am able to access only one of them through the network at a time. If you ping one of the domU it works perfectly but you cannot ping any of the others until you stop pinging the one and even then it takes a bit before you can. Ive looked around for a while and seen similar problems but nothing ever seems quite the same. Im probably missing something really stupid. Or is this the way the bridge is supposed to behave? Do i need to use a routed virtual network?
[Code]....
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May 12, 2010
I have 17 system (sys1,sys2,sys3.....sys17) in my office, and i am willing to setup a dedicated system to act as a firewall for that i have selected sys1 with two NIC(eth0 for local network and eth1 for internet) and i have configured to access internet in my office for that i have opened a wellknown port 80.but my clients are not accessing the internet..
and please check my sample IP configuration !!!
interface : eth1 (ISP IP)just for example
IP :192.168.0.2
gateway:192.168.0.1
dns:202.56.230.5
dns:202.56.230.6
Interface : eth0 (my local lan )
192.168.1.1
255.255.255.0
IP address of xp clients ranges form 192.168.1.2 to 192.168.1.16 with default 255.255.255.0
my question is that which gateway address and dns i have to give to my clients for accessing internet ?...
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May 18, 2010
I am learning to setup firewall in my home for that i have selected four system(sys1,sys2....sys4) for testing .I have configured sys2 to act as a firewall with two NIC. sys3 and sys4 are inside the firewall . sys1 is not connected to firewall for testing purpose.
the IP assignments are follows :
sys1 : ( fedora, not connected to firewall i am thinking, But i am not sure )
IP : 192.168.2.1 ,
gateway : blank
dns1 : blank
dns2 : blank
sys2 firewall ,IPTABLES )
code....
what happened is that sys1(not connected to firewall) can ssh to sys4(connected,inside firewall),since the rules are written not to ssh form sys1 to sys4..
then I came to know whatever the request I give, It directly goes as sys1 --> sys4. Not as sys1-----> sys2(firewall)---> sys4 .and the firewall is not filtering and processing anything for both inbound and outbound (i think it's my mistake some where). the requests are directly going inside without firewall.
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Feb 17, 2010
how would i set up my Fedora 12 box to connect to the internet using Android SDK's adb forward tcp:8080 tcp:8080 while my phone is pluged in via USB? I'm able to set it up for Firefox. But how do i set it so i can access the repos? i'm using my phone for an internet connection(not WIFI)the app is called proxoid
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May 19, 2010
I am trying to install opensuse 11.2 as DomU on a Host running also opensuse 11.2. When I use a file as destination everything goes well and the installation finishes with success. But when i install the DomU on an LV (Logical volume) with Yast, once the installation finished and the DomU restarts, I get the Error "Boot Loader didn't return any data"
I mounted the LV and I verified the presence of /boot/vmlinuz-xen, /boot/inirtd-xen, menu/lst etc ....
[Code].....
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Nov 8, 2010
I have Dlink Wireless G Access Point.
I can connect to my access point to surf internet. I setup my Dlink access point (password, network name, etc) in Vista by visiting "http://dlinkap/" in my web browser.
In ubuntu, I can connect and surf the web/internet but i cannot access the setup page.
When I try to type the "http://dlinkap/" to my browser then the browser will redirect it to google search.
I try 192.168.1.1, I can access my linksys router. but my dlink access point, i cannot access the setup page.
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Jul 8, 2011
I am running CentOS release 5.6 (Final) and have successfully installed PPTPD and this works great internally.
I want to access my Linux box remotely on the internet via my VPN tunnel. However I am not sure what I need to do on the Linux box to make this happen. My linux box is multihomed as follows
PSTN WWW <===========> ADSL Router Firewall <----------------> [eth1 192.168.x.x] Linux Box [eth0 172.16.x.x] <-----> to LAN
The desired topology is as shown.
VPN Client <------> Home ADSL Router <======= PSTN WWW =======> ADSL Router <------> eth1 Linux Box
1. The VPN is setup and bound to eth1 and eth0 and works well internally
2. IPSec, GRE and PPTP rules have been declared on the router which port map to eth1
However I am still unable to setup a VPN connection to Linux Box I suspect something hasn't been done or I have setup my NATing or IPTables correctly on the linux box.
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Oct 15, 2009
Any ideas why i cant connect to the internet with this server.
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Jul 24, 2009
i finished installing CentOS 5 and managed to connect to the Internet. My Network Interface Card (NIC) is "Atheros L2 Fast Ethernet" and it is not in the device list. anybody can tells me what i should do now to be connected to the Internet?
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Jul 19, 2011
I have been searching the web for a few hours and have not had any luck finding instructions on how to setup Xen HVM Dom0 on a CentOS 5.6. I have a test server with a stock install of CentOS 5.6 that support AMD-V.
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Oct 27, 2009
How do i set up my firewall to allow traffic from iperf?
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Mar 4, 2009
I'm an it student and a newbie in linux OS.
We have this final project that we have to set-up
a firewall in a linux redhat OS which i totally have no idea ..
i did some research but haven't found the right one.
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Dec 29, 2010
I just install xen and kernel-xen version 2.6.18-194.26.1.el5xen, booting into the xen kernel dom0 shows me continous colorful scrambling and scrolling. I can ssh to dom0 and get correct display but the dom0 console is where it shows the colorful garbage scrolling. i have the Supermicro X7DC motherboard with a XGI Z9 graphics card. GUI is not installed and I don't have the rhgb parameter in my grub.conf. My grub.conf is plain and unmodified.
#boot=/dev/md0
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
[Code].....
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Feb 9, 2010
I want to setup a router with firewall on ubuntu box that will connect windows pcs one serving as outside source and one serving as inside target.
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Dec 1, 2008
I go Xen on my home server: If I set some settings differently in two seperate guest os, say hdparm settings (Guest1=UDMA4, Guest2=UDMA5), how will xen deal with that ? (given that both are on same physical drive).
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Nov 27, 2008
We have a new Bussiness DSL line with 16 public addresses.What we want is to setup a DMZ to run some services and internet to the LAN. Here's a schematic of what we want:
Code:
Backup Internet Main Internet
connection connection
| |
| |
SDSL Modem BDSL Modem
[code]....
The webserver has the following settings:
IP: 12.34.56.125
subnet: 255.255.255.240
gateway: 12.34.56.126
What IPTABLES rules do i need to setup to "see" all IP's in the DMZ-2 from the internet?
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May 2, 2010
I am attempting to set up a firewall in my home network environment. the rest of the environment is windows, sorry I am attempting now so bear with me. what I have is a cable modem coming in, then my fedora 11 box with 2 nics, then the wireless router and the rest of the network.
everything works fine until I put the linux box in. If I put the firwall in the firewall sees the internet but the wireless router directly after does not. I am doing something wrong with the dhcp I am guessing. I dont want the firewall to give the address to the network I want the router to. I tried to get the firewall to do it (yum install dhcp leafnode) but it kept saying something didn't work right.
so I figure I will let the cable modem give the firewall an ip and the router give the rest of the network their ip's but how do I get the firewall and router to see each other and allow passthrough?
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Apr 20, 2010
Is there any way to setup the Centos Directory Server without an internet connection?? i tried using the command: yum install centos-ds
but this just tries to connect to the internet to to download the packages. Is there a site where i can find the package so that i can copy it to my server and install it or is there some other way to do this?
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May 17, 2009
Our firewall (debian) currently has 4 public ip addresses (eth0 1.2.3.4, eth0:0 1.2.3.5, eth0:1 1.2.3.8, eth0:2 1.2.3.9) and 3 internal subnets (eth1 10.1.x.x, eth1:0 10.2.x.x, eth2 10.7.x.x). We are experiencing the following two problems which I believe have the same root cause. 1) The firewall cannot access beyond the isp gateway (1.2.3.1). 2) From externally, we can ping eth0 with no trouble, however, pinging the eth0:0, eth0:1 and eth0:2 interfaces have results similar to the following:
Code:
PING 1.2.3.8 (1.2.3.8) 56(84) bytes of data.
64 bytes from 1.2.3.8: icmp_seq=2 ttl=57 time=59.0 ms
64 bytes from 1.2.3.8: icmp_seq=2 ttl=57 time=63.0 ms (DUP!)
64 bytes from 1.2.3.8: icmp_seq=13 ttl=57 time=59.3 ms
64 bytes from 1.2.3.8: icmp_seq=13 ttl=57 time=63.0 ms (DUP!)
64 bytes from 1.2.3.8: icmp_seq=24 ttl=57 time=62.0 ms
64 bytes from 1.2.3.8: icmp_seq=24 ttl=57 time=65.6 ms (DUP!)
I get the feeling that I'm missing something obvious, especially since all traffic on the internal subnets can access externally as normal.
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Nov 21, 2008
I have a fresh install of ubuntu. I am trying to load some new packages but I think I need internet connection. The issue is I cannot connect to the internet I think I need to setup a network package so I can connect to the internet? This is the first time I have used linux.
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Feb 15, 2009
i am confused with the wlan0 connection when i type iwconfig wlan0 in the terminal i got something like this:
[Code]...
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Sep 22, 2010
I'm using ubuntu 10.4The hardware is a usb adapter with ew-7718unThe network is recognized, but never succeeded to connect. all the network setting are equal to a laptop which connect using on-board card (same linux distribution). the adapter performed well on windows. The problem persist with two different computers both with ubuntu 10.4
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Mar 28, 2009
I installed Centos5.2 and have created 1 instance so far. It all works great, but when I created the new instance (using command line from ssh and "virt-install") it gave a message saying probing for video, not found, assuming headless and on I went with the install.
But now I have need for a framebuffer because I have a JBOSS/Java Captcha routine which throws an error if it can't use the X11 libraries or some such (I've resolved this before on a headless Amazon instance once by just running "Xorg"). But I can't run Xorg on my DomU because it can't find the fb device!
So, I searched around and did a makedev -d /dev/fb to create it, but it still doesn't work, because, I assume, the hardware isn't found anywhere. So... how do I get Xorg to work in this case? Or do I need to re-do the virt install and somehow force it to find video hardware (but how?)
Here is some salient output:
root@virty{/etc/X11}: uname -a
Linux virty 2.6.18-92.1.22.el5xen #1 SMP Tue Dec 16 12:26:32 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
root@domU{/etc/X11}: uname -a
[Code].....
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Jul 6, 2010
When I enable my ufw it completely shuts me out and I have no internet connection. When I do:
Code:
sudo ufw status numbered
I get:
Status: active
To Action From
-- ------ ----
[ 1] 80 ALLOW IN Anywhere
[ 2] 80 ALLOW OUT Anywhere (out)
But I need to disable my ufw in order to reconnect back to the internet. Why is that? Doesn't the above rules indicate that I should have inbound and outbound traffic even if my firewall is up?
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Nov 9, 2010
I have a ThinkPad x100e with a wireless card.Code:03:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8172 (rev 10)my problem is that I can't connect to my wireless network with Gentoo. I've been running Slackware64-13.1 on this computer and now have Windows 7, Ubuntu and Gentoo installed. Slackware, Ubuntu as well as Windows 7 connect to the wlan without problems. I'm using the driver rtl8192se, the module is loaded r8192se_pci and is the same with Slackware and Ubuntu.
I've read many posts and found that other people experience problems with Realtek wlandevices as well. But I have no Idea how to get connected with Gentoo at my wlan. It looks like that the netbook is connected for a very short time, but when dhcpcd broadcasts for a lease the connection is already closed.
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