Linux has duplicate address detection mechanism for IPv6 and nothing for IPv4 in kernel. At boot time, initscripts take care to check for the duplicate address but when an IP address is assigned using ifconfig or ip utility, no error is generated.
View 2 Replieswhat is the size of an IPV4 IP address?
View 2 Replies View RelatedI am setting up a server on a Intel Nuc PC. I have a problem though. I cannot get it to find a IPV4 address.
View 14 Replies View RelatedWhen doing the ifconfig command I only receive the IPV6 address. How do I specify that I need the IPV4 address???
View 3 Replies View RelatedI can connect & share my dual-boot PC with no problems under WinXPPro using wired or wireless. (I've another thread going trying to get the wireless-n usb adapter to work.) Two questions so I can get the wired shares to work. I want to copy beaucoup files from the Win7 PC to the dual-boot PC. When booting into XP, no problems. When booting into Ubuntu 10.04, nothing. I can see the Win7 PC but can't access it. My two questions then are these. First, is there some switch to enable fire & drive sharing under Lynx as there is under WinXP / 7? (Samba??) Second, how does one set the IPv4 address? Under WinXP it's one address and under Lynx it's another.
View 1 Replies View RelatedI am new to Linux so thought it would be a good learning exercise to try and setup an FTP server using linux.I have downloaded and installed Ubuntu 10 server edition and installed vsftpd, following instructions found on here I have configured the software and I can connect from an FTP client on my windows PC across the internal LAN.I have a couple of questions if I may:
1) a post on this forum suggests that local users can access the FTP server if the correct line is enabled in vsftpd.conf - I have done this and the fact that I can access it shows this is working I would think, however users added subsequently with the useradd command cannot access the server. Filezilla shows a could not connect to server error.
2) how do I give the server a fixed IPv4 address? It is currently using DHCP
3) I need to be able to put files into users folders for them to access offsite, but I don't want them to see each others filesfolders, can I do this?
how to make a Ubuntu 10.04 server VM look for an IPv4 address if it doesn't seem to by default?
View 3 Replies View RelatedI just installed Fedora core 11 and am trying to get httpd to start, but it gives me a [failed] message. When I run it with -e DEBUG, I get an error message like: "failure in name resolution, unable to find IPv4 address of 'uaserver'" In the httpd.conf I have my hostName set to localhost.
View 7 Replies View RelatedI installed it the standard way using emerge/portage, but it fails to start:
Code:
alpha skyer # /etc/init.d/apache2 start
* Caching service dependencies ... [ ok ]
* Starting apache2 ...
apache2: apr_sockaddr_info_get() failed for alpha
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName [ !! ]
* ERROR: apache2 failed to start
I'm used to have Apache unable to find pc's FQDN, as I don't set it, and it works without it.
From /var/log/apache2/error.log
Code:
[Sat Jul 23 06:41:12 2011] [alert] (EAI 2)Name or service not known: mod_unique_id: unable to find IPv4 address of "alpha"
Computer has IPv4 address set. I suspect that the nature of the problem is in the fact, that alpha has two network interfaces (it is used as router also). I've checked Apache conf files, but didn't find any meaningful directives to set interface or something similar.
Do anyone have IP address detection script like the one you see in this webpage.
View 6 Replies View RelatedI'm forging a gateway server, We have 2 Internet connection that goes to a load balancer router, and goes to my centos server and from our server goes to a switch for Internet distribution or routing.
OS-CentOS 5.5
[root@server etc]# uname -srio
Linux 2.6.18-194.el5 i386 GNU/Linux
My eth0 and eth1 has the following configuration and IP
[root@server etc]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# VIA Technologies, Inc. VT6105/VT6106S [Rhine-III]
DEVICE=eth0
BOOTPROTO=none
[code]....
Disabling IPv4 packet forwarding but i already changed it to 1 at sysctl.conf One of the online forum says i need to configure the named.conf deleted some and run it(named.conf) and successful but still when I run network service I still get the :"Disabling IPv4 packet forwarding: net.ipv4.ip_forward = 0" The network is getting the IP range but it doesnt get any Internet connection.
Current problem: fresh, clean install of Ubuntu 7.10 on known good hardware does not use/produce/get/have an IPv4 associated with eth0, so cannot connect to my home network for Internet access.
Background: Have been wanting to build and maintain a home file server for some time now. Have also been wanting some hands-on practice to help me progress from Noob to Intermediate, eventually advanced Linux Tech. (I have two decades of tech support experience, but only small fraction of that using command lines and almost zero Linux.)
Anyway, every time I download and attempt to burn a recent distro on my Vista Shuttle, I only end up making drink coasters and mini-frisbees. so I thought that I might have better luck if I used a Linux Workstation to download and burn a server distro.
That's where I an now. I took one of my fully functional WinXP systems offline, replaced the WXP HDD with an old 3.2 GB, dug out my 2008 edition Linux Bible, popped in the DVD that came with it, and installed Ubuntu 7.10.
Everything else seems to have progressed smoothly, but I cannot seem to get the onboard Via chipset ethernet controller to talk to the router. When I run "ifconfig" in Terminal, I see IPv6 info, but nothing for IPv4.
When I try to configure eth0, it doesn't matter whether I set it up for DHCP or static... nothing works.
Is there a command line tht I can use in Terminal to manually configure eth0 to use IPv4?
Our router is pretty old and only capable of giving fixed ip and there is no support for IPv6. Via the gnome networkmanager I try to set a manual IP to 192.168.1.123 and a netmask to 255.255.255.0 and a default gw at 192.168.1.1 . However, this does not work.
If I open a terminal and type:
Code:
sudo ifconfig eth0 inet 192.168.1.123
sudo route add default gw 192.168.1.1
Then I get a perfectly valid connection to the internet.
ifconfig by it self returns:
[Code]....
ffor me it seems that the gnome network manager doesn't save the information that I gently ask it to.
I can fix it with the CLI commands, but I would like to know whats going on.
I have tried clean installs of Knoppix v0.6, Xandros 2.0, and Ubuntu 7.1... same issue with all. I cannot seem to get eth0 (via chip on mobo) to get/have/use IPv4. ifconfig shows only IPv6. (I cannot paste any info because linux desktop is on different box.)
End result is that I cannot get the linux desktop to connect to my lan, either with dhcp or with static ip.
I have a belkin router configured as my gateway 192.168.3.1 and nothing fancy with the setup. I have dhcp open for 192.168.3.245 thru ...254 and at most there are only 4 systems in home connecting with dhcp at any time. all other systems have static addresses.
I have two decades of desktop and lan support under my belt, but relatively small amount of command line experience and almost no history with linux (unless you count a dozen unsuccessful attempts to burn linux distro install discs on this Vista desktop).
Therein lies the start of my prob. I need to build and manage a fileserver for my home, but cannot seem to get a working installer cd or dvd to burn from anything I download.
So I said to myself, "Self," I said, "you're a tech. Build a workstaion, use the DVD that came with your Linux Bible (2008 Ed.) to install one of the linux distros on it, then download a recent, stable server distro and burn it using the linux workstation."
Unfortunately, if I cant get an ipv4 connection to my home network, I cant get out to the Internet to download any newer ISO files.
So what am I missing or doing wrong? How do I tell linux to stop trying to use IPv6 and let me use IPv4?
BTW, eth0 works just fine if I install Windows on that PC, so I know its not bad HW. Could it be a driver issue? Or do I need to use some Terminal command to turn off IPv6 and reconfigure eth0 for IPv4?
Can someone explain me ipv4 notation like:
192.168.1.0/255.255.255.0
Does it mean "any host on 192.168.1.x" network?
On my 10.04 LTS Ubuntu Server installation, apache2 doesn't bind to ipv4. It does bind to ipv6. I didn't notice this at first, because from my home connection I could visit the webpages without trouble. I noticed it running netstats -ta:
Code:
tcp 0 0 localhost:10024 *:* LISTEN
tcp 0 0 localhost:10025 *:* LISTEN
tcp 0 0 localhost:mysql *:* LISTEN
tcp 0 0 localhost:spamd *:* LISTEN
[Code].....
Fedora 12 running under VirtualBox 3.2.8 w/ Bridged networking
Host OS Windows 7
I have 3 IP addresses set up in on my Fedora 12 installation:
Directory: /etc/sysconfig/network-scripts/
ifcfg-eth0 -> 192.168.0.170
ifcfg-eth0:0 -> 192.168.0.171
ifcfg-eth0:1 -> 192.168.0.172
Hostname is configured to host associated with 192.168.0.170 in /etc/hosts
When I reboot and execute
# ifconfig
eth0 is associated with the 172 address and the other addresses are not active. After I run
# service network restart
All of the addresses are active and associated with the correct interfaces. Content of my ifcfg files below:
/etc/sysconfig/network-scripts/ifcfg-eth0 :
Code:
# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth0
HWADDR=08:00:27:0A:9D:24
ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.0.170
PREFIX=24
DNS1=192.168.0.1
NAME="System eth0"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
GATEWAY=192.168.0.1
IPV6INIT=no
USERCTL=no
NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth0:0 :
Code:
# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth0:0
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.0.171
PREFIX=24
DNS1=192.168.0.1
NAME="System eth0"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
GATEWAY=192.168.0.1
IPV6INIT=no
USERCTL=no
ONPARENT=yes
NM_CONTROLLED=yes
ONBOOT=yes
/etc/sysconfig/network-scripts/ifcfg-eth0:1 :
Code:
# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth0:1
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.0.172
PREFIX=24
DNS1=192.168.0.1
NAME="System eth0:1"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
GATEWAY=192.168.0.1
IPV6INIT=no
USERCTL=no
ONPARENT=yes
NM_CONTROLLED=yes
ONBOOT=yes
After booting:
Code:
# ifconfig
eth0 ....
Restart network:
Code:
# service network restart
. . .
# ifconfig
eth0 ....
eth0:0 ....
eth0:1 ....
Normally I use 'netstat -an' to determine if a daemon is listening on a specific port. The excerpt of this command below doesn't list things like vnc (5900) on ipv4. It does however show it on ipv6. My issue is I want to know how to determine if it is indeed listening on ipv4 as would normally be seen with 0.0.0.0:5900. It would appear that all ipv4 ports are internally being redirected to ipv6. Of course this does simplify things, but it also leaves me unable to reliably determine the ipv4 listening status. How I can tell at a glance if a specific ipv4 port is being listened on? Is there a way to force netstat to list the ipv4 listens specifically?
Code:
art@eee1:/proc/sys/net/ipv6$ netstat -an
Active Internet connections (servers and established) .....
How do you I use duel stack i.e How do I use ipv6 packet inside ipv4 packet using fedora kernel 12 ?
View 1 Replies View RelatedI am new to UBUNTU. I installed the latest one alongside windows 7. I am having problem with the internet connectivity. I configured the static ip settings right I guess. Edited the Auto eth1 and assigned ipv4 settings manually and entered everything correctly.
Address 192.168.xx.xx
Netmask 255.255.255.0
Gateway 192.168.xx.xxx
DNS Server xxx.xxx.xx.x, xxx.xxx.xx.x
Do I have to put MAC Address as well? Which is addressed as 'Network address' in Windows where I put this MAC. I have on board Realtek RTL8101E Family PCI-E Fast Ethernet NIC (NDIS 6.20) Network adapter. Do I have to install the driver?
I am working on comparitive study of mobility models on intruder detection. An ns2 code for detecting an intruder is required.
View 2 Replies View RelatedIn my college many proxy : port (like 144.16.192.245:8080) are using to get Internet connection, performance of each proxy changes, how can i decide which one is working well at particular time. is there any way to switch over them automatically ?
View 2 Replies View RelatedWe run redundant switches that two nic's on each server connect to. We also run bonding on our servers. Because we have two switches, we can't run lacp or anything. If a switch goes into a crashed state where it doesn't pass traffic but still provides link, bonding thinks the interface is still up and thus will still send traffic through it. Does anybody know a better way to configure the fail over of the interface? This would be a similar situation to somebody using a media converter.
View 1 Replies View RelatedCurrently my OS is Ubuntu 9.04 Jaunty Jackalope Desktop OS and my web server is Apache2. I have a public address 60.x.y.z and my pc local address is 10.x.y.z. I have a web app in my Apache2 which currently run in localhost(10.x.y.z).
I would like to enable the web app so that it could be browse from outside. I know there maybe some port forwarding process and some commands involved in order to do that. But I have no idea on the steps to do that.
I am working on implementing a protocol on NS2.34 .I really need help to solve this problem . Actually , I don't now whether the problem is generated by the tcl code or the c++ code when I run the simulation, I get this result :
Code:
num_nodes is set 64
INITIALIZE THE LIST xListHead
34
45
channel.cc:sendUp - Calc highestAntennaZ_ and distCST_
highestAntennaZ_ = 1.5, distCST_ = 550.0
SORTING LISTS ...DONE!
code....
Consider the following program:
Code:
#include <stdio.h>
#include <stdint.h>
[code]...
Version 10.04 LTS. Installed desktop version and network worked but I needed a static IP address and the install configures for a DHCP configured address. I tried changing to static address using the System->Preferences->Network Connections application but was unable to get the system to come up with the network up.
So I manually modified the /etc/network/interfaces and the /etc/resolv.conf files. I restart the system but when I do an ifconfig, I don't see a configured IP address on eth0 (only the loopback address). If I run /sbin/ifup eth0 everything then works fine and ifconfig shows the correct address bound to eth0.
My files are as follows:
I'm running Ubuntu 10.10 and I'm having problems trying to assign it a static IP address. No matter what I put in the Preferences->Networking area (identifying the interface as Manual)... it still will query DHCP for an address if I run the dhclient command. I'm using to using ubuntu server where I just set the IP in the interfaces config file.
View 1 Replies View RelatedI am running my own Postfix mail server. Some time ago I noticed that most email was rejected because of the server's dynamic IP address. So I got a fixed IP address. However then I noticed that some mails got rejected due to failing the reverse DNS check. So my ISP told me to get a range of IP addresses and they could then create a PTR record for one of those addresses. That is now running but it turns out that the IP address used for the PTR record is a ... dynamic IP address. So Spamhaus PBL rejects my emails again.
View 1 Replies View RelatedI have a few external IP's assigned to me by my ISP. I have IPcop as my router/firewall. I am wondering how to bind 1 of my external ip's to my internal ip address. So I do not have to port forward, etc. For Example, 77.77.77.77 to 192.168.1.123 and on the server it see's the external IP address.
View 2 Replies View Related