Software :: Local Machines Showing Up With External Addresses?

Nov 9, 2009

I'm running a "relatively standard" home network environment. That is, I've got a DSL connection to my ISP, and am running a router/NAT environment that connects a number of machines -- Mac, Windows, and Linux -- to the external network. Internally, all the machines have addresses in the range of 192.168.0.x. However, because of the static/NAT address mapping, the machines whose internal addresses are mapped to external static addresses show up at external hosts as (the address range assigned to me by my ISP).

The other machines, which are on the network via NAT, show up as, the address assigned by my ISP. Finally, I'm running a local DNS server that handles addressing issues for my domains and sub-domains that are hosted on local machines. All the machines use this local server for their DNS, with my ISP's DNS server as secondary. All of this is to say that it's more or less a pretty typical configuration, and, in general, everything is working fine.

Here's where it gets tricky:

* Machine A is a Fedora 10 linux box, which hosts an externally visible domain and runs, among other things, a web server. It's assigned to one of the addresses that's mapped to a static IP address.

* Machine B is a MacBook Pro, running Snow Leopard (10.6). It typically runs at, which is NOT one of the addresses mapped to a static address, but "just" a NAT address.

Now, suppose Machine B hits the web browser run by Machine A: the log files should show the traffic arriving from the local address, However, it instead shows up as coming from, the external NAT-affiliated address. This seems wrong, especially since all the other machines on my network show 192.168-type addresses when hitting the web server.

I now change Machine B's address to -- one of the statically-mapped addresses. Browsing traffic is now arriving from, which is (I think) as it should be. I now change Machine B's address back to The web traffic on Machine B is now reported to be arriving from -- NOT It's complicated by the fact that I don't know where to look for the problem. All the log files on all the machines seem relatively normal; there are least no glaring problems screaming out from them.

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Ubuntu Networking :: Can See All Devices On Local Network And Their Local Ip Addresses

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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General :: Ruptime Not Showing All Machines In Network

Jun 3, 2010

I usually monitor machines in the network via ruptime. But one machine (lambda) acts very odd. It never shows up in the output of ruptime, unless ruptime is run from a particular client (delta). For example, say I am logged in lambda. This is what the output of ruptime and few other commands are:


Linux 2.6.18-53.1.21.el5 #1 SMP Tue May 20 09:35:07 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux Only difference between delta and other machines is the fact that delta is the file server that hosts the nfs directories shared in all the machines. All the machines are in the same subnet. All of them run either RHEL4, RHEL5 or CentOS5. lambda runs RHEL 5.4, delta runs CentOS 5.2. I tried restrting rwhod daemon on lambda, but no change. why lambda is playing this hide and seek with ruptime?

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Ubuntu Networking :: Hostname.local Addresses On Windows (using Dnsmasq)

May 5, 2010

I'm trying to get the Windows machines on my network to access hostname.local addresses. I want to do this without setting up extra software or settings on the Windows computers.

I already have dnsmasq on my server handling all DHCP and DNS requests. How can I get dnsmasq to return an IP address for a .local address?

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Ubuntu Networking :: Can't Ping Machines On Local Network

Jun 23, 2010

So in an effort to increase the speed of my netbook, I removed Ubuntu and installed Lubuntu on it. When I tried to mount my samba share as I normally do, I noticed it wasn't able to connect - mount error(113): No route to host. Sensing something fishy, I attempted to ping the machine (both by name and by IP) - Destination Host Unreachable.The machine I'm trying to connect to is using Ubuntu 10.04 x64. I attempted to ping the other way and it was able to connect to the netbook just fine. When the netbook was using Ubuntu, it was connecting fine. My iptables check out ok, but here is the output of iptables -nvL:


Chain INPUT (policy ACCEPT 213 packets, 21635 bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)


Does lubuntu have some funky firewall built in to it that I can't find? (I've Googled for information on a Lubuntu default firewall and can't find any)

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Jul 3, 2010

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Dec 26, 2010

I was setting up a new Linux box and router today and when I was looking to see if my custom DNS servers were being handed off in DHCP to my Ubuntu box I realized that the isp was shoving down onto my machines their dns suffix. Since I have configured my dhcp scope in the router to hand out a local dns suffix I am not sure why my suffix is not being used. Is there a way to use the .local dns suffix for both my linux and windows machines with dhcp instead of having to manually set the suffix?

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I am new to networking and trying to setup my own local area network using virtual box machines. I have installed BIND 9.7.3 using yum in Fedora (dns server) and created all necessary .conf and zone fil es. I am successfully able to resolve domain names on this host machine (dns server). for example dig @dns.domain.lan client1.domain.lan correctly resolves domain name.


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Ubuntu :: External Machines Can See Some Subdomains But Not All

Sep 16, 2010

I have a DNS server on my LAN at Going by the example in the O'Reilly DNS and BIND book I bought, I set up the domain and To my great surprise and delight, I can access in a browser from another PC on the LAN (as long as I add to the DNS servers). Encouraged by this victory, I decided to try to set up another subdomain at This kind of worked but not completely. Interestingly, I can get to both and on my server, but on my PC, I can only get to, not

Here is my
$TTL 3h IN SOA (
1 ; Serial
3h ; Refresh after 3 hours
1h ; Retry after 1 hour
1w ; Expire after 1 week
1h ) ; Negative caching TTL of 1 hour IN NS IN NS
; Host addresses

And here is my named.conf:
options {
directory "/etc/bind";

zone "" in {
type master;
file "";

zone "" in {
type master;
file "db.192.168.140";

zone "" in {
type master;
file "db.127.0.0";

zone "." in {
type hint;
file "db.cache";

#include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";
#include "/etc/bind/named.conf.default-zones";

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Server :: External Machines Can See SOME Subdomains But Not All?

Sep 16, 2010

I have a DNS server on my LAN at Going by the example in the O'Reilly DNS and BIND book I bought, I set up the domain and [URL]. To my great surprise and delight, I can access in a browser from another PC on the LAN (as long as I add to the DNS servers). Encouraged by this victory, I decided to try to set up another subdomain at [URL].

This kind of worked but not completely. Interestingly, I can get to both [URL] and [URL] on my server, but on my PC, I can only get to [URL] not [URL]. Here is my


$TTL 3h IN SOA (
1 ; Serial
3h ; Refresh after 3 hours


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Mar 26, 2009

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Apr 29, 2009

I have Fedora 9 on an external disk, I use it at home on a desktop and at work on a laptop. It works great except that the two machines have different display adaptors. I currently have the xorg.conf arranged so that I manually comment out the driver that I am not using. It works, but I would like not to have to edit the xorg.conf every time I switch machines:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder63) Thu Feb 5 00:18:17 PST 2009
# Xorg configuration created by system-config-display


I have tried googleing for something but cannot arrive at a satisfactory search phrase to yield the required results. I looked at [URL] and tried multiple Device and Screen sections but could not get it to work.

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Ubuntu Networking :: Homepage Routed To D-Link Router Login Page On Local Machines?

May 20, 2011

In addition to 2 "desktop" machines, I recently set up an Ubuntu Server with Apache2, but when I try to access my www.homepage from a machine locally connected to the same router (via both wired & wireless interfaces), I am directed to the Login page of the router, not to the www.homepage. Yet, when I access the www.homepage from elsewhere, my www.homepage is accessible.

I can browse to my www.homepage by entering the local IP address into browsers on both local machines, so I know the machines are talking to each other. Just not letting me get in via normal internet browsing channels.

Server: Ubuntu 11.04
Webserver: Apache2
Router: D-Link DIR-615
IP Address of: (reserved on router, static on server)


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Ubuntu Networking :: Multiple External IP Addresses With Single Physical Ethernet Card And Virtualization

Feb 16, 2010

I recently installed Ubuntu Server 9.10 with the intent of using it as a platform for running a couple of Windows XP virtual machines along with Linux/Ubuntu.

I had no problems getting the server installed. Had no problems getting the network up and running so that I had access to both my internal network as well as external connectivity to the internet. Had no problems getting a VM installed and putting Windows XP inside of it. Had no problems setting up a bridge between the WinXP virtual machine and the physical ethernet card (eth0).

What Im having trouble with is figuring out how to bridge from multiple VMs AND Ubuntu natively through one physical ethernet card.

When I set up the bridge, it knocks out the static IP address of the ethernet card that was set up initially with Ubuntu when first installed before the VM was created and installed. Therefore, connectivity within Ubuntu natively is lost.

Similarly, am having trouble figuring out how the second VM (also going to be running WinXP) is going to get its connectivity since it doesnt seem to like me setting up 2 bridges to the same physical ethernet interface card.

I need all 3 machines to have static IP addresses and be visible/accessible from the external network for either web/mail/dns/etc servers on the Ubuntu side and for remote PC control functionality on the VM side.

I have tried setting up alias ethernet interfaces (eth0:1, eth0:2, eth0:3) with static addresses which work fine from native Ubuntu in presenting multiple IP addressees, but it seems that Im not permitted to bridge to these alias interfaces.

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Jan 20, 2011

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Feb 26, 2010

I am running Valgrind on my program. It shows me two errors but mentions only addresses against them and not actual code even on a debug build.

The output is

==23002== Memcheck, a memory error detector.
==23002== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.
==23002== Using LibVEX rev 1575, a library for dynamic binary translation.


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Aug 10, 2009

Before my windows clock was at local time + 2h. Now my Win clock is ok but my F11 clock is at local time +2h. What happened?!

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Jun 17, 2010

I am working on a Debian 2.6.26-19 Distribution with exim4 as MTA. After a system restart a problem occurred with delivering emails to local addresses. These local addresses use a 1and1 mailserver for email. The MX records for the local domain are set correctly but exim does not use a DNS lookup for these addresses because it identifies them as local addresses. I figured this out by executing the exim4 -d -bt command. The dns lookup part of the result looks like this (I replaced the actual address with placeholders):


The eventual result of the exim4 -d -bt command is: [user]@[domain.ext] is undeliverable: Unrouteable address How can I make sure, that exim4 makes a DNS lookup for the local addresses instead of skipping it? I know that I have to edit a exim4 configuration file, but I could not figure out which and how.

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Jun 16, 2011

I was trying to add a virtual PDF printer and show I installed cups-pdf. Supposedly it is supposed to list the virtual pdf printer in the System->Administration->Printing dialog when I choose Add printer.But it does not do that. All it shows is the remote printers on my file server.So, opened up a web browser and when to localhost:631 and used the cups interface to add a virtual pdf printer, but still it does not show up in the printing dialog.

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Jul 18, 2011

I have just installed Ubuntu 11.04 and all's well except that my external HDD is not showing up . how to get the HDD up as it has some important data on it.It normally showed up automatically on other Distros

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Ubuntu Networking :: Not Showing Proper Hostname On Local Network

Mar 8, 2011

I found that I needed to connect them to the same workgroup, which I now have and for the most part it works. However, for one of the computers I do not want to use a .local domain, rather I need to use a .org. But no matter what I do, other computers on the network think it is a .local hostname. Currently the /etc/hostname on the computer file is as follows:


Here is a screenshot of an ipscan done from another computer on the local area network so you can see what I'm talking about.

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Aug 29, 2010

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Jan 13, 2010

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May 29, 2011

Im having some problems, when I plug in a USB drive or an external HDD to my computer it doesn't mount or show on the Desktop. It only shows up in "disk Utility".

I have tried ALT+F2 then typed "gconf-edit" went to Apps> Nautilus> desktop and check "Volumes Visible" but when I plug in anything in the USB it still doesn't show.

it shows up in the side pane only. I would like it to show up on the Desktop

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Jan 21, 2009

I wanted to be able to have separate NICs with separate IPs connecting to separate gateways on a machine so I could put an ftpd on each one. I tried binding an ftpd to each, and running separate instances of the ftpd. I tried virtual hosts.

NOTHING worked. I could either use one ftpd or the other. I could either connect via ssh on one IP or the other. the second I turned one NIC off stuff would work again. I messed with basic iproute commands, andnothng worked until I got this script to run, which allowed me to use each NIC independant of the other.

#ip route flush all
ip route del default dev eth1
ip route del default dev eth0
ip route del table 1
ip route add table 1 to default via dev eth1

But now, samba client doesn't work. cifs mounting doesn't work either. It can't connect.

BEFORE I ran that script, I could connect via ssh, or to the ftpd running on the machine using a LOCAL IP - AFTER, I have to use the external IP, or I cannot connect. I know that has something to do with it, but I do not have the advanced linux routing knowledge to redo the script or come up with a solution.

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Aug 29, 2010

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The files are there but I cannot view them. Also if I copy or move a file to that folder is dissappears but the file is still on the drive.

Any help. I also already hit show hidden files and nothing.

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Jul 31, 2010

I've installed Debian inside Virtualbox on Mac OS 10.5.

I want to set up networking so I can (a) reach the outside internet from inside Debian (Virtualbox), and (b) reach the virtual Debian from my Mac. (I don't need to be able to reach the virtual Debian from anywhere but the Mac.)

I can't seem to figure it out. If I set the Virtualbox networking to "NAT", I can reach the outside world from Debian, but I can't reach Debian from Mac OS. If I set the Virtualbox to "Host Link Adapter", I can reach Debian from Mac OS, but I can't reach the internet from Debian.

I'm sure I've set up the way I want before, and I don't remember doing anything special for that, so I must be missing something simple today.

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Networking :: External Nic Unreachable From Local Network

Jan 11, 2010

I've got router with: eth2 - local network (, ppp0 - uplink (x.y.z.a)

my firewall:


# Generated by iptables-save v1.4.5 on Mon Jan 11 12:22:25 2010
:PREROUTING ACCEPT [1038480:666298388]


somehow iptables -t nat -A PREROUTING -i eth2 -d x.y.z.a -j DNAT --to-destination helps, but imho there should be some other solution. kernel is, architecture is x86_64.

P.S. i've also tried iptables -A POSTROUTING ! -d x.y.z.a -s -j MASQUERADE that didn't help either.

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Jun 8, 2011

I'm running Telnet Server, VFTP, and VNC on a Fedora 14 box. The box's internal IP is This machine is configured to live in the DMZ, The firewall is up on both the router and this box. I can remote in from home using our external IP. I can FTP. I can Telnet. All using our external IP. When i'm in the office, i can remote in using our external IP. I can FTP. I can Telnet. Again, all with the external IP. If i attempt to telnet i get a connection refused. i can ping the 192.168 address

nmap tells me that all 1000 ports on are closed
nmap tells me that my expected ports are open on the external IP.

.... This is a relatively new conundrum as it "used to work", and only appears not to since our last reboot (power outage). I know i have to be missing something simple here, but i differ to the experts.

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