Networking :: Access Public IP From Local Subnet
Jan 22, 2011
does somebody know how dnsmasq / iptables need to be configured such that requests to my public IP from lan are correctly NAT'ed to the host that handles them? Currently my routing device treats them like "oh, these are anyway for me, gnam gnam" which actually doesn't work.Unfortunatly setting up NAT rules that redirect requests from my lan correctly as they are redirected from wan is an option I would like to use only if there is no other possibility.I would like some kind of solution that treats packets that are sent to my public IP as normal packets that are not looped back before they even get out. So they would need to be at least sent to the wan gateway where they are directed back where my firewall can successfully treat them like all other public requests.
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Aug 5, 2010
following are my Linux router information
eth1= WAN IP= 110.88.89.66/32
Gateway= 110.88.89.65
eth0= LAN IP= 192.168.1.1/24
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
MASQUERADE all -- 0.0.0.0/0 0.0.0.0/0
[Code]....
My ISP gave me IP Pool 110.88.90.68/29 to use this on my LAN. my question is how can I use this IP pool on LAN side interface. i think now its simple. 192.168.1.0 /24 is my LAN network and I can not change this, because i have near 180 PCs on my LAN.
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Aug 6, 2010
I will try to explain a bit first about my network typology: I have one cent os 5.5 machine with 2 nics - external one 86.x.x.122 and internal one with 2 IPs: 192.168.1.1 and 89.x.x.121. The ideea is that I have a public subnet (86.x.x.120/29) of IPs which are routable only through 86.x.x.122 so I have a webserver hosted on a different machine with the IP of 89.x.x.122 and GW 89.x.x.121 - everything works perfectly fine, except that I cannot access from the internal network 192.168.1.0 / 24 the so called DMZ (roughly) - the 89.x.x.122.
What really makes me crazy is that I setup the IPtables rules correctly because I can access the webserver from the outside world but I cannot accessit from the internal network...
what I'm missing - why the 192.168.1.0/24 cannot see the 89.x.x.122 machine... What IPtables rules should I add?
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Jan 27, 2010
There seems to be a lot written about virtual networking but I am not sure what approach to take in my situation. My local subnet has a public block of 128 addresses. I have a virtual host running on my machine. My machine has a static address and I'd need to assign one to the guest. I have edited the guest's interface file and assigned a public address to it's eth0. However the guest cannot ping out and I can't ping in.
By default the virtual machine manager creates a virtual network (virbr0) and assigned a private address range to it. I have tried to create a new virtual network using a subnet of my public range (/31) but the manager says the range must to a minimum of 16 addresses (/4). It doesn't look possible to achieve my aims using the virtual machine manager.
In the past I have used the procedure laid out here:[URL].. which is to manually create a bridge. I am not sure that is relevant for my 9.10. I think I would have to disable the network manager if I were to do that and I am not sure how to do that.
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Dec 26, 2010
I am trying to make Apache web server, it's work but cannot be browsed outside my subnet.I am on huge LAN network, not sure how it works, know it have TL-SL2428WEB Smart Switches and probably some kind of DHCP, every user have maximum 64KB, just plug UTP cable, and I have static address on that subnet like: "my.sub.net.ip" witch I know from Java NetworkInteface class or when I try to update IP on my www.dyndns.com Dynamic DNS account with ez-ipupdate, but my subnet is connected to Web with another IP like "my.isp.provider.ip" witch I get from whatismyipaddress.com and I check that is my Cable ISP provider web IP. It is possible that there is more subnet layers between these two IP.Problem occurs when I try to access to my web site from another computer. When I set dyndns host name to be my.sub.net.ip or use localhost everything works fine from my computer, I can access my web site, Apache work, I can use ssh. To illustrate you it work like this: Go to DNS server, find my host name, get my "my.sub.net.ip" and say "This is actually my localhost IP, no need to go on Web, lets loopback". But when I try from another computer even from my college's computer on same subnet it don't succeed. When host name is set on "my.isp.provider.ip" of course nothing works.
We, users of LAN, don't have access to our LAN nor we have admin. For example sometimes we stuck without net and we cannot even press reset button on switches or something like that, we have to wait for day to they, owner of LAN, order some professional to do that. It seems they are just user of Cable TV and IP, and they bay and install LAN without any kind of admin. Also, I use Fedora 13, with httpd, ssh and others packages that comes with Fedora 13 DVD. I know to write bash scripts, use yum, very good in C++ and Java, great programmer, but newbie in networking, , a very little Perl, html, web servers, I heard for DHCP, DNS, NAT, IP forwarding. How you see it is problem in my lack of knowledge about networking. I hope that I succeed to describe by problem with enough details. Please, try to help me. I be very graceful for any kind of help. Don't afraid to bomb my head with any kind of information hard to understand.
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Feb 15, 2011
I have cent OS 5.5, i am not getting proper command for the same.
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Jul 22, 2011
I have TWO L3 + router switch (say switch1 and switch2). I created VLAN100 with VLAN ID 100 in both the switches. I created router 192.168.1.1/24 in Switch1. I created router 192.168.2.1/24 in Switch2. Switch1 is connected with 1.x/24 PCs. PCs are configured with 1.1 gateway. Switch2 is connected with 2.x/24 PCs. PCs are configured with 2.1 gateway. Both Switch1 and switch2 are connected by a trunk to carry VLAN100 data.
1)I have few PCs of 1.x connected to say Switch1 Is it possible for PC with IP 192.168.1.100(x) to ping PC with IP 192.168.2.100(y)?What are the configuration required in both switches to make them communicate ? All the device in both the subnets should ping/communicate with each other.
2)Move PC (192.168.1.100) to switch2. Move PC (192.168.2.100)to switch1.What will happen when PC(1.100) ping (2.100) and vice versa?What will happen when PC(say 1.80 in switch1) pings PC (say 1.100 in switch2) and vice versa? What will happen when PC(say 1.80 in switch1) pings PC (say 2.100 in switch1) and vice versa?
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Feb 19, 2010
Running Ubuntu 9.10. In the Remote Desktop config dialog I get: "Your desktop is only reachable over the local network. Others can access your computer using the address 127.0.0.1 or tabatha.local." I understand this means only the loopback ip address is available. All my other machines show their true local ip address (e.g., 192.168.1.104) in this dialog. Thus I cannot log on to this desktop from other machines.
When I try to do a remote logon from another Ubuntu 9.10 box (or from an XP box using a VNC viewer), I get: "Connection to 192.168.1.102 has been closed." What steps are needed to make this machine show its actual ip address? All file sharing between the various machines is working properly and all windows shares back and forth between XP and 'nix, and among the the vaious XP boxes and linux boxes are available as designed.
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Aug 2, 2011
I'm trying to write a p2p file sharing program using python's built-in libraries. Everything is going well. The only thing is that i'd like to be able to use openssl public and private keys so only a host with the public key could access/decrypt the filesharing. I've gotten these libraries (httplib, basehttpserver, ssl, os) to work using just a pem file containing both the public and private keys but no success with them seperately. Can someone point me in the right direction or offer an alternative? PS, the goal of the project is to create an anonymous, decentralized, secure file sharing program. I want to be able to upload this to sourceforge so everyone can use it, if that's any incentive
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Jul 4, 2011
I installed Redhat Enterprise linux server5. it has two LAN card and two subnet connected to these two LAN card. i can browse network from these two network easily. But i created VLAN on one network card.Now i cant browse network from these VLAN subnet.
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Feb 4, 2010
Is it possible to provide remote Windows users access to a LAN via the Internet when the LAN itself is connected to the Internet via a SOHO router that is assigned an IP address dynamically? An LQ thread from 2004 includes a suggestion to use VPN and DynDNS.com. Is that still a good solution? Are there any security issues?
Assuming:VPN is a good choice. DynDNS.com or similar can be used to give remote clients the public IP address of the SOHO router. the SOHO router is configured to forward VPN traffic to a Linux system acting as the VPN gateway. then, for a LAN of ~20 IP nodes and less than 5 simultaneous remote clients, are there any other VPN server software solutions to consider other than OpenVPN, Openswan and strongswan?
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Aug 5, 2009
I have two nagging problems on one network which I do not have on another elsewhere, both using uptodate Debian servers. The server is on the private subnet behind a router/adsl modem. The symptoms of the one which does not work
1) Users cannot access their web site from lan. If they try, they get to the router web interface, same as if they entered http:10.0.0.138 which is the router's lan address.
2) Users cannot access smtp or pop3 service using the domain name, they can access it only using the servers LAN address.
I fear that I might have not set up the router properly because appart from that the two servers are almost identical but I do not know where I might have made an error.
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Feb 23, 2010
If I allow, my server's IP is:
11.11.11.11
If I allow 11.11.11.11, and block 22.22.22.22
22.22.22.22 can't access the server
But if I allow 11.11.11.0/24, and block 22.22.22.22
22.22.22.22 can still access the server!!
Does anyone know why that is?
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Oct 13, 2010
How I can benefit from a public external IP? Do I need a public IP to access my computer from a remote site?run a tftp server ?
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May 13, 2010
I could no handle/circumvent on the past week, despite of the several "googling" and documents reading. I will try to mention all needed bits... I'm managing a network with the following structure:
eth0: internal net
eth1: DMZ
eth2: 10 mbit/sec sync line with eight public /29 IP's + a /30 interconnection network. All public IP's must use the interconnection's network gateway.
eth3: ADSL with ppoe with fixed IP (ppp0).
Now, a few extra info:
- All internal traffic is routed through ppp0 except when it's destined for DMZ and public IP's range.
- DMZ traffic is routed either through ppp0 or eth2. This is done by source IP.
- eth2 has on IP from the interconnection network, and six public IP's are also defined on eth2. Command: "ip addr add ...."
[code].....
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Aug 27, 2009
I was having a discussion with someone who said that telnet, FTP, HTTP plain-text authentication in the local subnet is ok because it's a switched network. Also, that these protocols are not good over the net but in a local subnet they are just fine.
I know that someone can plug a hub in the network port and connect 2 (or more) PCs and see the packets. Also, heard about ettercap but haven't really delved into it. I know dsniff was written to prove the point that unencrypted protocols are bad. Would like to get opinion about unencrypted protocols over a switched networks.
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Oct 28, 2010
host is windows 2003 server 64-bit
guest is ubuntu 9.04 server 64bit
Qemu : 0.11.1
Qemu manager: 7.0
from Qemu manager, if network card is using User Networking, it's a NAT and I can see that Guest Ubuntu has an ip address 10.0.2.15 and is able to access the internet. However, as Guest ubuntu is running server so I want to do use Tap networking and I assue with Tap, the Guest ubuntu will get an ip address which is in the same subnet as host machine by dhcp. so from Qemu Manager 7.0, I changed Network card to be:
NE2000PCI
Vlan Number =0
VLAN Type: Tap Networking
Mac address: tap0's mac address from host
TAP Network Adpator: Tap0
Note that tap0 was created by openvpn. and then fired Ubuntu guest, ifconfig shows no ip address on eth0 (which has the same mac address as Tap0) so the guest Ubuntu has no ip address and can't access public.
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Feb 6, 2011
I am using Fedora and I can see the public folders from other computers on my network as 'public on xxx'. Is there any way to mount that to the local fs? The way it is now I can only access it in the file manager.
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Mar 25, 2011
I need to publish my local webserver from my lan to access outside using internet, I have public ips provided by ISP my local webserver address is 192.168.1.5 and I want to bind this local address to a public ip (Ex: 61.8.153.212) to use it out side my lan through squid.
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Mar 22, 2011
I have created more A record in dns. one record is link to my local ip, i have already static ip, how can i access my local website from global.
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Apr 8, 2010
Two servers, one is RHEL 4, and the other is RHEL 5. They are both on the same subnet, one is 10 the other is 11. I added the Webmin rule to the iptables config file but for some reason, the RHEL 4 server, I can access Webmin but the RHEL 5 server I can not. I checked the iptables file and they are the same for both servers, except two rules which are for other ports.
I'm reading about the iptables and had a problem when I manually added the port 10000 entry after the REJECT entry, but wondering if I need to move it up higher or maybe there's another possible block?
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May 13, 2009
the only error message I can find comes from "dmesg|tail"all it shows is
"no IPv6 router"any body know what is going on here or where where to look for more clues the next time I get around public wifi Oh the windoze washers and apple polishers don't seem to have any problems at all
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Jun 4, 2010
my computer with ubuntu 9.10 is in a LAN. We use static ip and do not have dhcp. I can go up to our server and browse our website but cannot access internet. my ifconfig, iwconfig, lspci are as follows...
[Code]....
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Dec 11, 2010
I have recently upgraded to 10.04 and I am trying to access my apache and sshd servers from the net but I have not succeed so far when those two are using their regular ports.If I change their ports to something greater than 1024 they work fine.80->8010 22->4567(I can access the servers when I am connecting from local net: 192.168.1.0/24) Is this restriction build into the new kernel? Is there something I can do to fix this without recompiling the kernel?
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Jan 25, 2010
Up until yesterday I was able to access these devices through the web interfaces that they use. I'm running Ubuntu Karmic 9.10 I have 3 PCs running on my network, and 2 NAS devices: Ubuntu (main computer, also has an XP partition)) - static IP 192.168.1.30 Ubuntu netbook - DHCP IP Windows XP (HTPC) - static 192.168.1.50 Linksys NSLU2 (was running Debian, problem arose when trying different configuration, now back to stock firmware) - static IP 192.168.1.100 Dlink DSM-G600 - static IP 192.168.1.120
I used to be able to able access these just fine using my main Ubuntu setup. Now, it will no longer display the pages. Internet access is fine, i can even access my DSL/Router device's internal config page. The netbook and the Windows HTPC can both log into these devices, as well as the XP partition of the Ubuntu system. I have tried using a VM of XP within Ubuntu, bridging the network device, i have the same symptoms - internet is fine, cannot access local network web-logins.
Access to fileshares among all machines remains unchanged. another odd behavior is that i can SSH into the NSLU2 device from all the machines, but i get odd things from this computer - it will let me log in, asks for a username and pass, but if i run anything like mc or htop, it just blanks the terminal in an odd way. from other computers the login and display are fine.
[Code]...
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Jan 16, 2011
i would like to setup one of my old pcs as a file server and internet gateway; we are living in a large building shared with 40 others. the ubuntu box would be the one connected to the internet via ethernet and sharing connexion via wifi. i haven't started yet - presently, i am doing the ground work and reading before to start i understand sharing the internet is relatively simple and can be done from the GUI
What we would like is slightly like BT Fon or BT Open Zone in the UK: you can hook on a free network but in order to access outside (internet: email, web, ftp, etc) you need to login login would help us monitor fair usage. I imagine something with username and password for each user would do: as we are a few in the same building not everyone is actually paying for the connection and we don't want to end up with rather large excess bills. So the ones who are paying access both files and internet; those who dont just have access to the files on the local server.
Do i need Ubuntu server to set this up? What hardware would be ideal - given we are all far from rich but willing to have a nice setup
It would be great if you could share some knowledge around the topic and eventually provide some tutorial; also any heads-up on the hardware side would be great! (signal booster, etc - there's 3 floors and 3 buildings)
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Jan 26, 2011
I'm trying to setup an Apache webserver on my computer in order to practice HTML5/CSS3 for an upcoming competition I'm in. I'm able to access my site from inside my network, but I cannot outside my network. I've had several people try, and they all report that the server just times out. I'm running Ubuntu 10.04 and Apache 2.2.17
My site is at [URL]
Here is the output of ifconfig
Code:
eth0 Link encap:Ethernet HWaddr 00:26:22:50:0f:0a
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
[Code]....
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Jul 13, 2009
Can any outsider(from Public N/w) access my pvt. network.i.e. my clients of my subnet? If yes how ??and if no why?
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Aug 14, 2009
I'm trying to get vsftpd running with both anonymous and local user access to the same folder. The directory I'm using is /tftp with the following permissions:
dr-srwxrwx 7 root root 12288 2009-08-14 15:54 tftp
My vsftpd.conf is this:
anonymous_enable=YES
local_enable=YES
write_enable=YES
[code]....
I set the default "ftp" user's home directory to /tftp (was /var/ftp).
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Jan 26, 2011
I have an Ubuntu 10.10 in my work environment and have issues handling the Exchange 2007 server's public calender.My outgoing server is SMTP | Incoming server is POP3 (my office have disabled IMAP and run MAPI). First I tried evolution but it said ""The server is running Exchange 5.5, evolution-exchange connector supports 2000 and 2003 Server" Installed thunderbird and i am happy with it. The only thing which i would like to do is access my exchange public calender and firefox will not be able to do it in OWA.
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