Networking :: Can I Use NAT And Some Local Hosts Without It On System Box
Aug 7, 2010
I'm using NAT on an AP with linux. Is it possible to route an OUTGOING host not over NAT?
I'm using SNAT but could also use MAQUERADING I think. Because both are in POSTROUTING table and this table is the last one I don't think there is a solution or is there any solution?
Background:
I'm using a local VoIp client which I want to have an own ip for routing question in my network but don't want all other local machines as seperate ip's because if done so i.e. without NAT the routing table is very complicated ...
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May 24, 2010
The little home server of mine has bind configured as a caching dns server. I would like to configure it to resolve local host names. I know dnsmasq can do this, so what would someone need to do to get bind to do this?The network is entirely private with all private IPs which are distributed by dhcpd.(While writing this, the feeling creeps in that it would be easier to just have dnsmasq running.)
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Jun 27, 2011
Problem:Your company network has internal only hosts / websites with names that end in .local, e.g.Your freshly installed Ubuntu machine works fine on the network, has internet access, etc. but cannot connect to these particular systems.Testing DNS with tools like dig / nslookup works fine, but normal name resolution with ping / telnet / browsers does not work.Solution:1. Open a terminal window2. Enter the command sudo nano /etc/nsswitch.conf3. Change the following line:hosts: files mdns4_minimal [notfound=RETURN] dns mdns4to this:hosts: files dns4. Press Ctrl-X, Y, Enter to saveExplanation:Ubuntu ships configured to do name lookups for self-configuring networks, based on the AppleTalk / mDNS / Bonjour protocol. In the configuration shipped for the resolver, this protocol is considered the final aurhority for the ".local" top level domain, and DNS will not be checked. The above configuration change eliminates this and restricts lookups to (a) /etc/hosts file, followed by (b) DNS
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Apr 30, 2010
I can reach other hosts by means of their global addresses by either the IP address or hostname (that has the global address). What I want to (also) do is have a hostname that references the IPv6 link local IP address (an AAAA record in DNS, or just the fe80::<whatever> address in /etc/hosts) and use that host name in commands to access that host. The problem is, an interface ID is needed when making such a reference.
It sure looks like the programs just pass the host name string on to the resolver library, which does not understand the significance of the '%' even though it could find and see that the name preceding the '%' is consistent with that being an IPv6 link local address (e.g. the logic could have been "split at first % and see if preceeding name is found as a link local address and accept that if so, or ignore the split otherwise" ... but it isn't). Is there a different syntax for this ... or was it overlooked in the design of programming around IPv6?I want to be able to address a host by its link local address, while still using a mnemonic instead of having to type the IPv6 address.
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Aug 17, 2011
Well, as many proxy applications, GNOME Network Proxy Preferences only allow to ignore hosts. What I want to do is exactly the opposite. I only want to use the proxy for few sites. Is it possible to define only the allowed hosts in any way?
PS: I know FoxyProxy add-on for Firefox does this, but 1)I don't use Firefox and 2)I want the proxy settings system wide not only for browser.
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Jul 20, 2010
I have about 50 servers with at least 200 GB free on each host. I need close to 10 TB of continuous shared storage between almost half of the servers for a new app I building.
I was looking into buying a storage device but was wonder if I could get any use out of the free space on all the servers, grouping all of the free storage from the hosts into one reduduant storage array.
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Apr 13, 2011
I'm trying to pass multiple dpmains thru one ubuntu server to various hosts on my local network.
[url] should be sent to the /var/www folder on the local host.
[url] should be forwarded to an IIS box on my local network (owa.nunya.local)
[url] should be sent to another ubunto box on my local network (smtp.biznet.net)
I have tried placing VirtualHost entries in /etc/apache2/sites-available/default and [url]and [url] both work but [url] gets forwarded to the c:inetpub folder on the IIS box.
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Mar 1, 2011
Actually, I have two ISP's internet connection on firewall. I want to use third party software on my workstation if any one link gets down, I got the alarm on local system. How to get an url for download any freeware software.
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Aug 29, 2010
I just installed open Suse 11.3, and I cannot SSH my school. Upon further investigation I could not even ping any machines outside my local area network. Ironically I could nmap machines outside my local area network.
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May 2, 2011
I'm trying to use ssh-keyscan to get some known_host file population going on, but I have a ton of hosts I want to scan, all with multiple aliases in /etc/hosts. Is there a way to use my current /etc/hosts file to do an ssh-keyscan instead of making a special list of hosts that (from what I've read) ssh-keyscan needs?
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Nov 14, 2010
since upgrade to suse 11.3 every time I reboot pc the file /etc/hosts is reset to default value. I am a web developer so I need to put in there my aliases for 127.0.0.1. It is annoying to do it again and again. Luckily, I don't restart my system very often but still I would like to avoid that.What should I do to stop this resetting? Or is there another place in 11.3 where should I put my entries?
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May 16, 2010
I'd like a way to see all of the devices on my local network and what their local IP address is. I recall that I used wireshark to troubleshoot a similar problem a while back, but it doesn't seem to have a way to see all of the devices- only the traffic. (I'd like to do this without having to physically interface with my router if possible, and I am in an encrypted network if that matters)
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Jun 28, 2011
I have installed a web server on my local network. Everything is well configured and web pages are shown correctly from Internet (outside the local network) using the domain or the public IP.The issue is if I try to see that web pages (using the domain or the public IP) from inside the local network. In that case the router config page (192.168.1.1) is shown instead of the web pages.From inside the local network I'm only able to see the web pages using the internal IP address (192.168.1.XX).
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Feb 12, 2009
Is it possible to log into a remote windows computer from my local linux computer and vice-versa using the "telnet" command?
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Dec 22, 2010
On Linux I do:
rdesktop remotepc
How do I copy and paste between my local system and the remote system?
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Jan 26, 2011
Probably an easy (which means stoopid) question...I am trying to reroute a website using my hosts file so that it matches my servers certificate file for testing without effect dns and the live site.When I went to edit my /etc/hosts file it is non-existent. I have, I am assuming in it's place, hosts.allow and hosts.deny. Can anyone explain why I do not have a hosts file?
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May 5, 2009
The code listed below is an excerpt from a script that I am writing. The goal is to verify that a directory on a remote server is available to the local system. If that is not the case, a log file is written, and all filesystems that were previous unmounted, are remounted on the local system.
Code:
# # Unmount all NFS mounts prior to the archive process.
umount -a -t nfs
# Mount the remote directory (NFS) prior to running the make_net_recovery script.
# Make sure there is a <remote server> folder located in the /mnt directory. If it is
# not already there, create one.
mount <remote server>:/<local system> /mnt/<remote server>
# Verify the remote directory (NFS) is available. This directory is needed
# as it is the destination for the iso images. If it is not available, stop
# here, and write the results to a log file.
df |grep <remote server> > /dev/null
RC=$?
echo $RC
if [ ${RC} -eq 0 ]
then
echo successful
else
echo not successful >> /tmp/make_net_backup.log && mount -a
exit
fi
Is the syntax shown above correct?
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May 25, 2010
I've got an Ubuntu server hosting our websites and other various things here in our own home. We recently switched to a router that doesn't support loopback (abomination), so I've set up hosts files on our computers so we can access our own sites when on our home LAN.
However, we often take our laptops as we travel about, and I'm guessing due to the hosts files when we try to access our sites, it'll look on whatever local network we're connected to for our server, which won't work, obviously.
Is there a way to set up something like a hosts file that'll only try to look up the local IP of the server when we're on a specific network (our home one), or have one that tries to look for the local IP first, then proceeds to try and resolve the domain name and use the external IP if the local IP doesn't work?
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Jan 17, 2011
[Code]....
What I want: multiple virtual hosts with ssl and only 1 ip address: In my example: server = 192.168.227.129
[Code]....
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Jun 25, 2011
Not sure what iis going on, I can ping some hosts on the internet but not others see below (adobe is not the only example) Works OK from another host on the same network with same GW and DNS iptables is turned off
[root@havoc init.d]# ping www.arrl.org
PING www.arrl.org (184.106.62.248) 56(84) bytes of data.
64 bytes from www.arrl.org (184.106.62.248): icmp_req=1 ttl=55 time=94.1 ms
64 bytes from www.arrl.org (184.106.62.248): icmp_req=2 ttl=55 time=93.0 ms
64 bytes from www.arrl.org (184.106.62.248): icmp_req=3 ttl=55 time=99.4 ms
64 bytes from www.arrl.org (184.106.62.248): icmp_req=4 ttl=55 time=96.8 ms
[Code]...
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Aug 31, 2010
I have a problem reaching some hosts on the Internet, namely newegg.com and djangoproject.com. On the same machine and network connection using Windows 7 the host names resolve properly and I can connect to them. The host names are resolving in Ubuntu, but I cannot connect to them.
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Apr 26, 2011
I have embedded linux (apm distributive). I modify /etc/hosts file and that changes not affected.
What could be the problem?
Example
/etc/hosts
127.0.0.1 localhost
127.0.0.1 hana-009
ping hana-009
ping: bad address 'hana-009'
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Mar 31, 2010
How can I find all the devices(printers,etc...) and computers along with their OS if any installed that are connected in my intranet (devices/computers may be down here)?
I did this earlier using netstat or nmap not sure what I used and how I did.
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May 28, 2010
I have to build a netwrok for small lab and office setup.Setup as belowI have a PC running with Centos 5.4 and has 4 NIC cards. eth0, eth1, eth2 and eth3
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May 6, 2010
I have a small office network with windows machines and a Linux Internet access server (CentOS 5.4). For Internet access I use masquerade, so everione can access every Internet service.
I periodicali have quite big traffic from one of the hosts, but I can't figure out which one is that?
Is there any linux command which will show me the bytes/packets (or any useful infos) going to specific hosts?
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May 20, 2011
I've 3 hosts images installed in virtualbox, that every time I reboot an image, the ip address change.
The 3 images are ubuntu.
I would like to configure these images in a way that, every time I reboot the images, I can access them by the name, and not by the ip.
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Sep 15, 2009
I have a Dell PowerEdge 1650 server with 3 NICs in it. I am trying to use one NIC (eth0) to connect to the internet, the second NIC (eth1) to share the internet connection to a LAN, and the third NIC (eth2) to connect to the LAN.
It is running Ubuntu server 8.10
The problem that I'm having is that NetworkManager (version 0.7.0) keeps setting eth2 as the default connection, and then I don't get any internet at all from the server.
My main goal is to be able to share files from the server to computers on the LAN. The secondary goal is to have a virtual machine hosting a Halo server, connected through eth2, so that it can host LAN games. But that is a secondary goal after I get the connections to work.
I've been looking around and finding other people who have done bits and pieces of this, but not the whole thing. I had been hoping to simply use the NetworkManger, but I don't mind editing config files.
Also I can't seem to find any good instructions on editing the /etc/network/interfaces file. The man file is incomplete, and everything seems to point back to the man file.
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Aug 24, 2010
I bought a network printer, gave it a host name, address should be assigned by my cable or DSL router. Thats what DHCP and DNS is made for right?Now I will print to that printer from my (Lucid) Kubuntu box and resolve it by it's hostname.I can't ping it by printername, I can't ping it by printername.local.It works when I login my router, read out the IP address and hostname the printer registered at the routers DHCP-table and use that address.What can be done that a router transfers the hostnames it has in it's IP-table to clients upon DHCP resolve AND whenever a client get's a new IP-Address?
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Aug 30, 2010
What happen if we assign a static IP address to both linux and windows host?Consider host A is a ubuntu machine and host B is a windows machine. I first set a static IP for host A (W.X.Y.Z) and connect to it through ssh. Then I duplicate that IP for host B (W.X.Y.Z).The result was that I could no longer connect to the ubuntu machine!
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Sep 12, 2010
I have read the man files on hosts (deny/allow) and think I understand how they are supposed to work but reality has proven me wrong.
My simple test case was to add "ALL: ALL " to the end of hosts.deny which I though should make the Internet not work. I can still look up hosts fine so apparently I don't understand these files or Ubuntu is ignoring them.
This is my hosts.deny file
Code:
Code:
and hosts
Code:
hosts.deny is the only file I have edited (so far)
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