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• Ping reply not getting to LAN machines but getting in Linux router Gateway

  - by Kevin Parker

  I have configured Ubuntu 12.04 as Gateway machine.its having two interfaces eth0 with ip 192.168.122.39(Static) and eth1 connected to modem with ip address 192.168.2.3(through DHCP). ip-forwarding is enabled in router box. Client machine is configured as: ip address 192.168.122.5 and gateway 192.168.122.39 Client machines can ping router box(192.168.122.39).but when pinged 8.8.8.8 reply is not reaching Client machines but in the tcpdump output on gateway i can see echo request for 8.8.8.8 but never echo reply.Is this because of 122.5 not forwarding request to 2.0 network.Can u please help me in fixing this.

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• Forwarding subdomain to different port on Windows IIS 7

  - by Ralph

  I have a IIS 7 server with Plesk setup on a Windows 2008 R2 server and I have created a subdomain sub1.domain.com, which by default leads to my webserver on port 80, but I don't want that. I want the subdomain to lead to my port 25566 instead (for a Minecraft server), how can I accomplish this? I tried this with host headers / bindings but that resulted in a port already in use warning. How can I do this? How can I make my sub1.domain.com lead to IP.IP.IP.IP:25566? Any help would be greatly appreciated.

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• Routing WIFI and LAN for specific traffic

  - by jakebird451

  I have two network devices aboard my macbook pro: WIFI (en1): Used for general traffic. Connects to an ip of 192.168.19.* via DHCP LAN (en0): Used for specific traffic. Connects to an ip of 192.168.2.10 as a static IP. Does not connect to a router, only a switch for direct routing connection. I have 4 IP addresses I need to access on the LAN: 192.168.2.1 192.168.2.21 192.168.2.20 192.168.2.30 The rest of the traffic needs to go to WIFI. I have tried setting up a routing table for the specific ip addresses, but I only managed to mess up my network. I do not venture out into the world of networking too often, but this was the latest command I have been trying: sudo route add -host 192.168.2.30 -interface en0 This command killed my ability to use ping. It told me that ping could not allocate memory (is that even possible)? It also killed my wifi access. Logging out and back in fixed the issue. I really do not mind to make this solution permanent, so I am fine with a temporary routing.

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• iptables, allow access from certain MAC addresses

  - by user788171

  Presently, I limit which clients can access my server by using IP addresses via iptables, only approved IP addresses can connect. However, the problem with this is if a client is on a laptop and goes to a different location, they can no longer connect because the IP has changed. For a variety of reasons, iptables authentication is the only option I have. Is there a way to restrict access by device instead of ip address. For instance, only allow certain MAC address to connect to port 5000. Is it possible to do this via iptables? Note, the computers are not on the same network, they could be connecting from anywhere in the world.

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• Squid3 not working. Access denied.

  - by Nitish

  I installed SQUID3 on a Linux machine with two ethernet interfaces (eth0 and eth1). I used the default settings in the squid.conf file and uncommented the two lines acl localnet src 192.168.0.0/16 and http_access allow localnet. eth0 is connected to a router, which provides Internet access. It is assigned an IP 192.168.1.2 by the router. I manually configured eth1 to have an IP address 192.168.5.1. It is connected to a switch. Systems having IP addresses 192.168.5.x are connected to this switch. I ran these two commands for NAT: iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.5.1:3128 iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 But when I try to access internet from a system having IP 192.168.5.2 through the proxy I get an error that says "Access denied". What is wrong with my configuration?

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• Hyper-V VM guest can't ping any machine

  - by Haadka

  So I got Host: Hyper-v enabled machine with four NICs, only one enabled. Network type: External IP configuration are correct for both host and guest (getting it from the DHCP of the company network) The same configuration works on a machine with single NIC But With this other machine, with 4 NICs, there is no Internet in the guest, actually it can't ping any IP expect the host (pings host IP only, not the name) I searched the Internet and did every solution, more than once, with no success.

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• Why is REMOTE_ADDR only sometimes available as an Apache environment variable?

  - by Xiong Chiamiov

  To avoid having to parse X-Forwarded-For in Varnish, I'm trying to just set a header on the SSL terminator (currently Apache) that stores the direct client IP in a header. On our development machine, this works: RequestHeader set X-Foo %{REMOTE_ADDR}e However, in staging it doesn't. Specifically, the header is empty, as illustrated by both varnishlog: 13 TxHeader b X-Foo: (null) (On the development machine, this shows the IP address as expected.) Similarly, logging REMOTE_ADDR shows that it only appears to be populated on the dev machine: # Config LogFormat "%{X-Forwarded-For}i %{REMOTE_ADDR}e" combined CustomLog "/var/log/httpd/access_log" combined # Log file, staging <my ip> - # Log file, development <my ip> <my ip> Since the dev machine is, well, a dev machine, it is different in a number of ways; however, I can't track down which difference is causing this. The versions of Apache are the same (2.2.22), and I don't see anything relevant in any of the standard config files or /etc/sysconfig/httpd. And the rest of the system is reasonably similar, since they're built off the same CentOS 5 base image. I can't even tell from the Apache documentation whether REMOTE_ADDR is expected to exist or not as an environment variable, but it clearly works on one machine, whether by fluke or design, and the inconsistency is driving me mad.

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• Windows Server 2003: Nat Port Forwarding Not Working

  - by jM2.me

  The setup is following: Internet (108.99.XXX.XX) <- Windows Server 2003 (10.0.0.1) <- Switch <- Office Computers (10.0.0.100-200 some static routes some manual some automatic) Windows Server has NAT installed on it and two network interfaces are configured properly. The problem is, whenever I try to forward port 80 (or any other) from office computer (lets say 10.0.0.100), it fails. Nic #1 Settings: All settings are obtained from ISP Nic #2 Settings: Set manually IP: 10.0.0.1 Mask: 255.255.255.0 Nat Server is configured to automatically assign IP addresses to private network. Settings are: IP: 10.0.0.0 Mask: 255.255.255.0 Forwarding was done in Routing and Remote Access (local) - IP Routing - NAT/Basic Firewall - Local Area Connection (right click_properties) - services and ports - Web Server HTTP - Private Address: 10.0.0.100 SO what is causing the problem of failure to forward any port from other computer inside private network?

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• How do i Setup a Mac OS X Server - NameServer behind an Airport Extreme?

  - by basilmir

  I have a Mac mini server i want to setup to host a couple of things. My setup is as follows: The WAN connection (static IP and ISP nameservers) goes into the wan port of the Airport Extreme. The Mac mini server is connected to one of the ethernet ports. The mac mini will host my domain something.com. My settings so far: Airport Express gets: 96.x.x.x as the external static IP from the ISP 174.y.y.y as the nameserver Mac mini server always gets a reserved DHCP IP from the Airport Express: 10.0.1.3 is the server's ip 10.0.1.1 as the dns (this ip is the airport express itself) My dns server has an A record pointing to ns.something.com and a PTR doing the reverse. I've already added my 96.x.x.x to point ns.something.com with my registrar as attached. NOW: Nobody seems to be able to access my ns.something.com to resolve any of my records. From a any computer in my network I CAN see my ns and everything works. The outside on the other hand does not... it's as if the airport extreme which "holds" the exterior 94.x.x.x address doesn't pass DNS along to my 10.0.1.3 ns server. I have the server managing the airport. Isn't this supposed to work?

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• Can't access to access to my web server inside a network with Firewall on

  - by ianenri

  I set up a Web server with the following: There is the Internet Router, configured to Port Foward port 80 to my computer assigned to my PC's IP: 192.168.1.128 My PC is connected to that wireless router from wlan0 Then, my PC is also connected to my device (which is the webserver) with a crossover-cable usign eth0 having this anohter IP: 10.42.43.1 Finally, my device (the webserver) is connected with eth0 with this IP: 10.42.43.55 As you can see, I need to install a reverse-proxy to be able to resolve to my device's webserver. I installed pound (proxy server) in my PC and configured properly to make 192.168.1.128 resolve to 10.42.43.55 So, I just typing my ISP provided IP 200.x.x.x resolves to my device webserver. But there's a problem: I HAD TO STOP MY FIREWALL. I don't know how I need exactly configure the firewall in SUSE YAST2, or at least iptables. Stopping it is not an option, not for security reasons, just because there's port fowarding rule that is needed to give Internet access to my device too. I'm using openSUSE 12.1

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• How to stop live network traffic displayed in terminal?

  - by Jakobud

  For our network we are working on building a new firewall box and we just installed Smoothwall on it to test it out. When I start up the box, before the login prompt even appears, all of the live IP traffic is appearing in the terminal (source/destination IPs, MACs, Ports, etc). I wait for the boot sequence to finish, but all I see is this IP traffic. The login prompt never comes up. I finally get sick of waiting and press CTRL + C and it says "Entering Run Level 3" and then I get a login prompt finally. Once I login, the IP traffic continues to fly through the terminal even as I'm trying to type commands. How do I turn this stuff off? Is this the default setting for Smoothwall to have all this IP traffic going by on the screen? It essentially renders using the terminal to being useless.

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• Why does windows (file) explorer try to connect to port 80 (http) instead just using smb?

  - by Erik

  Background: On an almost freshly installed pc I get a message along the lines of : "windows cannot find some-file-server-name. Check the spelling and try again"... when trying to access any fileshare. Troubleshooting so far: pinging works. Both by ip and by name the almost identical pc next to this one can access the file server everyone else can access the file server the pc in question can not access other open fileshares but it can connect to the internet And now for what I think is the interesting part: running wireshark with ip.addr == local.ip.add.ress and ip.addr == server.ip.add.ress tells me that it tries to connect over http. the server replies but after a few messages back and forth it stops the other machine of course just uses smb I guess port 80 just means it defaults to webdav, but I haven't been able to find anything that can cause this. Googling it the closest thing I found was this http://www.techrepublic.com/article/get-vista-and-samba-to-work/6353849 but then again this was an XP pc and I wasn't able to connect to other native Windows shares (and I tried the solution anyway and it didn't work.)

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• Nagios: Is it possible to have multiple IPs for a host?

  - by Aknosis

  In our office we have dual WAN setup, if our cable connection drops we still get connectivity via our T1. The only issue is that our office network is no longer available on the same IP so all Nagios check go critical because they can't connect. What'd be awesome is if I could have Nagios try IP 1 by default but if for some reason its failing on that IP try IP 2. I doubt this is possible with a default install but I'm wondering if there is any add-ons or some other magic that could make this work?

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• Nginx https rewrite turns POST to GET

  - by x7311

  My proxy server runs on ip A and this is how people access my web service. The nginx configuration will redirect to a virtual machine on ip B. For the proxy server on IP A, I have this in my sites-available server { listen 443; ssl on; ssl_certificate nginx.pem; ssl_certificate_key nginx.key; client_max_body_size 200M; server_name localhost 127.0.0.1; server_name_in_redirect off; location / { proxy_pass http://10.10.0.59:80; proxy_redirect http://10.10.0.59:80/ /; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } server { listen 80; rewrite ^(.*) https://$http_host$1 permanent; server_name localhost 127.0.0.1; server_name_in_redirect off; location / { proxy_pass http://10.10.0.59:80; proxy_redirect http://10.10.0.59:80/ /; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } The proxy_redirect was taken from how do I get nginx to forward HTTP POST requests via rewrite? Everything that hits the public IP will hit 443 because of the rewrite. Internally, we are forwarding to 80 on the virtual machine. But when I run a python script such as the one below to test our configuration import requests data = {'username': '....', 'password': '.....'} url = 'http://IP_A/api/service/signup' res = requests.post(url, data=data, verify=False) print res print res.json print res.status_code print res.headers I am getting a 405 Method Not Allowed. In nginx we found that when it hit the internal server, the internal nginx was getting a GET request, even though in the original header we did a POST (this was shown in the Python script). So it seems like rewrite has problem. Any idea how to fix this? When I commented out the rewrite, it hits 80 for sure, and it went through. Since rewrite was able to talk to our internal server, so rewrite itself has no issue. It's just the rewrite dropped POST to GET. Thank you! (This will also be asked on Nginx forum because this is a critical blocker...)

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• Localhost service accessible from remote address

  - by dynback.com

  I have on my home Windows box - Cassini server with localhost:10000. And I want it be accessible in internet by my static IP. Tried netcat, "nc -l -p 10001 localhost 10000". But it results in "invalid connection to [IP] from [IP] 16074" Also before that it was working on Opera Unite properly, but now only writes a message: "An error occured. See error log for details". I dont know where to get that log.

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• SSL on app - nginx web server

  - by Adam

  I am running an nginx web server where I redirect all http requests to https (with a self signed cert). Here is how I REDIRECT all http requests to https in the nginx config file: server { listen 80 default_server; listen [::]:80 default_server ipv6only=on; server_name my.server.ip; return 301 https://$server_name$request_uri; Problem is - I cannot seem to do so for an app running on a port. Example: http://my.server.ip:1234 does not redirect to https://my.server.ip:1234 ir works fine on all other urls like http://my.server.ip/temp etc. How can I modify the nginx config file to force that app url through ssl?

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• Sending mail via Exchange, why am I being flagged as spam?

  - by Dan

  Exchange 2007 uses direct DNS for all outgoing mail. Mail that is sent from our public IP (1.2.3.4 - this is the IP of my mailserver) is delivered to the spam folders for providers such as Comcast and yahoo. Currently, our SPF looks like this: v=spf1 ip4:1.2.3.4 mx a:mail.domain.com ?all MX: mail.domain.com.(10) The reverse DNS entry on our ISP is mail.domain.com for our IP The banner HELO response from our server is <220 mail.domain.com Our IP address is NOT blacklisted anywhere, and the Cisco Senderbase gives us a score of Good What is the reason our mail doesn't look legit?

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• How broken is routing strategy that causes a martian packet (so far only) during tracepath?

  - by lkraav

  I believe I've achieved a table that routes packets from and to eth1/192.168.3.x through 192.168.3.1, and packets from and to eth0/192.168.1.x through 192.168.1.1 (helpful source). Question: when doing tracepath from 192.168.3.20 (from within vserver), I'm getting kernel: [318535.927489] martian source 192.168.3.20 from 212.47.223.33, on dev eth0 at or near the target IP, while intermediary hops go without (log below). I don't understand why this packet is arriving on eth0, instead of eth1, even after reading this: Note that you may see packets from non-routable IP addresses when running the traceroute or tracepath commands. While packets cannot be routed to these routers, packets sent between 2 routers only need to know the address of the next hop within the local networks, which could be a non-routable address. Can someone explain that paragraph in human language? Based on short initial trials so far, everything else seems to work without causing martians. Is this contained to the nature of tracepath operation or do I have some other bigger routing problem that will cause work traffic breakage? Side note: is it possible to inspect martian packet with tcpdump or wireshark or anything of the sort? I'm have not been able to get it to show up on my own. vserver-20 / # tracepath -n 212.47.223.33 1: 192.168.3.2 0.064ms pmtu 1500 1: 192.168.3.1 1.076ms 1: 192.168.3.1 1.259ms 2: 90.191.8.2 1.908ms 3: 90.190.134.194 2.595ms 4: 194.126.123.94 2.136ms asymm 5 5: 195.250.170.22 2.266ms asymm 6 6: 212.47.201.86 2.390ms asymm 7 7: no reply 8: no reply 9: no reply ^C Host routing: $ sudo ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo 2: sit0: <NOARP> mtu 1480 qdisc noop state DOWN link/sit 0.0.0.0 brd 0.0.0.0 3: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:24:1d:de:b3:5d brd ff:ff:ff:ff:ff:ff inet 192.168.1.2/24 scope global eth0 4: eth1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:46:46:a3:6a brd ff:ff:ff:ff:ff:ff inet 192.168.3.2/27 scope global eth1 inet 192.168.3.20/27 brd 192.168.3.31 scope global secondary eth1 # linux-vserver instance $ sudo ip route default via 192.168.1.1 dev eth0 metric 3 unreachable 127.0.0.0/8 scope host 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.2 192.168.3.0/27 dev eth1 proto kernel scope link src 192.168.3.2 $ sudo ip rule 0: from all lookup local 32764: from all to 192.168.3.0/27 lookup dmz 32765: from 192.168.3.0/27 lookup dmz 32766: from all lookup main 32767: from all lookup default $ sudo ip route show table dmz default via 192.168.3.1 dev eth1 metric 4 192.168.3.0/27 dev eth1 scope link metric 4 Gateway routing # ip route 10.24.0.2 dev tun0 proto kernel scope link src 10.24.0.1 10.24.0.0/24 via 10.24.0.2 dev tun0 192.168.3.0/24 dev br-dmz proto kernel scope link src 192.168.3.1 192.168.1.0/24 dev br-lan proto kernel scope link src 192.168.1.1 $ISP_NET/23 dev eth0.1 proto kernel scope link src $WAN_IP default via $ISP_GW dev eth0.1 Additional background Options for non-virtualized network interface isolation?

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• forward all ports via htaccess to new address

  - by user875933

  I have a chat server running on my local machine that listens to different ports. I want to use the sub-domain of one of my accounts to access it. I intend to manually change the redirect whenever my local machine gets a different ip address. So: chat.example.com:123 would redirect to dynamic.ip.address:123 I am trying to accomplish this with .htaccess and RewriteRule I have tried: RewriteEngine on RewriteRule ^(.*) http://dynamic.ip.address/ [L, R=302] but this doesn't work. When I try chat.example.com:123 nothing happens. When I input chat.example.com into the web browser, I get dynamic.ip.address Is .htaccess the right tool for this? I am using a simple web host that gives me ssh access, but not much more.

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• basic help for Nat configuration needed

  - by Klaes S.

  I have a server with a IP 1.0.0.5/24. This is the main IP address of the server, and now I have two other IP addresses for the server, they are 1.0.2.30/24 and 1.0.2.31/24. I want to make a VirtualBox running another OS accessible through the Internet, and only allow the specified IP to reach the virtual box. I'm new to iptables and therefore I need some basic help and getting started information about this. The hosting provider does not allow more than on MAC address per switch port, which means that I'm not able to make bridge as far as I know. Futhermore I want the host, to reject the extra IPs so its only the VirtualBox / virtual machine that accepts the request's on the extra IPS.

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• RDC not working from outside

  - by Cotten

  I've set up Remote Connection according to : http://windows.microsoft.com/is-IS/windows7/allow-remote-desktop-connections-from-outside-your-home-network That is, Allow remote connections to the computer you want to access. Make sure Remote Desktop is able to communicate through your firewall. Find the IP address of the computer on your home network that you want to connect to. Open your router's configuration screen and forward TCP port 3389 to the destination computer's IP address. Find your router's public IP address so that Remote Desktop can find it on the Internet. When I'm inside the LAN, RDC works flawlessly. When I try to connect to the ip given by my ISP it cannot connect. I've setup port forwarding for 3389 on my netgear router. Thanks!

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• How to configure my web server for public and development service

  - by Steve

  I have one and only one web server, which runs Windows Server 2008 and wamp. Now I would like to setup SVN on the server so I can program the trunk version of the website. Every time I branch a version and put it to public. While developing on the trunk version, I also want to be able to test it. The web server has 5 IPs so I can use one IP for public website(the branch) and another IP for trunk development test. I believe one wamp server can only handle one 80 port request thus can only handle one website. How can I configure the server so it can handle one IP request and direct to my branch and handle another IP request and direct to my trunk?

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• How to setup VPN on home network

  - by Tone

  I am a software developer. I travel and sometimes have a need to access my files at home and tweak other family members computers. I would like to connect to my home network via VPN and then RDP into whatever machine i need to. Currently i have a Windows Server 08 machine, which is my file server, database server, web server (for development work), source control repository, etc. (and also somewhat of a workstation when i need it to be). I want to use this same machine to run my VPN through. I have a linksys WRTG54 router. My ISP is AT&T DSL, with a dynamic IP address - so i'm assuming I'll either need to request a static IP or sign up with one of those static ip services.. where it keeps your dynamic ip synced up with a static one. While I do understand software engineering I am no expert in networking. What do i need to do to setup my VPN?

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• Forward my http requests blindly through to a new server

  - by Jason

  I need to forward any http request from my old server IP to my new IP. I migrated servers and there are a few domains that have a high TTL and I could not update. Is it possible to take all HTTP requests from one server running centos/whm/php/apache 2+ and forward them to the new ip? Since I have hundreds of domains I'd prefer a solution that involves running an app on the linux box that will push requests automatically to the new box. Thoughts? Cheers

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• Smoothwall: How to stop live network traffic displayed in terminal?

  - by Jakobud

  For our network we are working on building a new firewall box and we just installed Smoothwall on it to test it out. When I start up the box, before the login prompt even appears, all of the live IP traffic is appearing in the terminal (source/destination IPs, MACs, Ports, etc). I wait for the boot sequence to finish, but all I see is this IP traffic. The login prompt never comes up. I finally get sick of waiting and press CTRL + C and it says "Entering Run Level 3" and then I get a login prompt finally. Once I login, the IP traffic continues to fly through the terminal even as I'm trying to type commands. How do I turn this stuff off? Is this the default setting for Smoothwall to have all this IP traffic going by on the screen? It essentially renders using the terminal to being useless.

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