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• Can't get iptables firewall working correctly

  - by Jay

  I'm setting up a new Centos 5.6 system and can't get my iptables firewall to work correctly. it won't let me use SSH through it. I'm new to Centos but not to Linux or iptables. I've been removing things until I have isolated the problem. I set up the firewall with a default ACCEPT rule for the INPUT chain. I can connect through to the server fine. If I change the command to only allow traffic from the interface connecting to my trusted network it stops working. Working: iptables -A INPUT -s 0/0 -d 0/0 -j ACCEPT Failing: iptables -A INPUT -i eth0 -s 0/0 -d 0/0 -j ACCEPT I've double checked the ip address I'm using corresponds to eth0 using ifconfig. Any ideas where I went wrong?

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• ESX Firewall Command Troubles

  - by John

  Hi, I am working on creating some firewall rules to stop some of the SSH brute-force attacks that we have seen recently on our ESX server hosts. I have tried the following rules from the CLI to first block all SSH traffic and then allow the two ranges that I am interested in: esxcfg-firewall --ipruleAdd 0.0.0.0/0,22,tcp,REJECT,"Block_SSH" esxcfg-firewall --ipruleAdd 11.130.0.0/16,22,tcp,ACCEPT,"Allow_PUBLIC_SSH" esxcfg-firewall --ipruleAdd 10.130.0.0/16,22,tcp,ACCEPT,"Allow_PRIVATE_SSH" However, these rules are not working as intended. I know that if you do not enter the block rule first, then the allow rule will not be processed. We are now having the issue where the first entered allow rule is being ignored such that the block rule works and the last entered allow rule works. I was curious if anyone had any ideas on how I could allow a few different ranges of IP's with the esxcfg-firewall --ipruleAdd command? I am at a loss and am having a hard time locating examples or further documentation about this. Thanks in advance for your help with this.

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• Windows server 2003SP2 as LDAP replica master for Mac OSX 10.6

  - by FrancoR

  Hello there, we have a single domain controller with Windows 2003 with few child. All the users are in the main DC. We have already created a connection from AD to Mac Xserve 10.6 and can read all the users, but: 1. If the DC goes down (or the net), Mac lose all the users, so no file access, no emails, no nothing. 2. the users are in read only. Mac admin cannot reset password, change attribute and so on. What we need is a stable environment where both AD admins and LDAP admins can manage the users; if one server goes offline the users of the other server should work (email, shared folders) just fine. Thanks in advance P.S. we already tried to connect the MacOSX to Windows LDAP, instead of AD, but we're unable to do it: MacOSX requires DNS IP (gotcha), user admin and password (ok) and a root LDAP password we're unable to find any reference of it in Windows 2003.

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• Set up router to vpn into proxy server

  - by NKimber

  I have a small network with a single LinkSys router connected to broadband in US via Comcast. I have a VPN proxy server account that I can use with a standard Windows connection, allowing me to have a geographic IP fingerprint in Europe, this is useful for a number of purposes. I want to setup a 2nd router that automatically connects via VPN to this proxy service, so any hardware that is connected to router 2 looks as though it is originating network requests in Europe, and any hardware connected to my main router has normal Comcast traffic (all requests are originating from USA). My 2nd router is a LinkSys WRT54G2, I'm having trouble getting this configured. Question, is what I'm trying to do even feasible? Should the WRT54G2 be able to do this with native functionality? Would flashing it with DD-WRT allow me to achieve my objectives?

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• Filtering downloading a file

  - by Ozgun Sunal

  people. i know there are several types of firewalls operating at different layers of OSI. ACLs(layer 3 firewalls filter based on port numbers and IP addresses), SPI(which examines the patterns of data at layer 3 and realise that data content is malicious or not) and application layer firewalls which is capable of understanding the data at that level. Considering this, i'll give an example and learn what i need to do. Lets say, we have a computer has access to the Internet. i want to download a file or display a web page from a website but block access to the another website/s or downloading. To do this, i cant block access to the web browser on the 3rd party firewall bcos that will shut down all access. ACLs wont already do it. So, which kind of firewall will make it possible to filter specific traffic and how?

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• how to communicate in typical router switch router scenario?

  - by Kossel

  I'm learning routing using packet tracer simulation and I think this is a very commun scenario: let's say pc4 is the server... why I can't ping from PC1 to 192.168.2.253 (router1) but I can ping 192.168.2.2 (pc0) aren't they the same subnet? what am I missing or have to do in order to reach pc4? (192.168.100.254) from pc 1 (192.168.1.1) is there something like "default gateway" for router? thanks for advice PS: during the simulation it shows error "The routing table does not have a route to the destination IP address. The router drops the packe (from 192.168.2.253 to 192.168.1.1)"

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• Computer connects to lan, but not the internet

  - by Jay

  I have a computer with Vista Home that can connect to the router, but it cannot get on the internet. I cannot ping google.com, the request times out. I've tried this on two separate networks and have no trouble with other computers connecting. I've renewed ipconfig, reset winsock, updated the wireless adapter, and the hosts file looks fine. I've tried disabling the firewall as well as a direct wired connection. I did a scan with Norton and it didn't find anything. Is there anything else I can try before resorting to a system restore? Update (Copied from Answer) Windows Update was able to find updates and install them (though, they could have already been downloaded previously). When I pinged Google by using their IP 66.102.9.103, it said it lost 25 percent of the packets. I successfully flushed the DNS but it didn't help. Also, I found safe mode with networking works fine.

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• Windows 2012 remote access can't connect

  - by Gelo Volro

  I have installed Windows Server 2012 for about 9 months ago. Earlier I could connect to my server with an external IP perfectly, but the license for the remote desktop services has ended. First, I thought it was the reason, why I couldn't use my server as RDP-server, to which users may connect. But, than in web I read, that it's possible to use windows native features, just to remove the RDP services, which are trial and the server will work as RDP-server, but with some limitations ( for e.g. such free RDP service may accept only 1 connection and other connection will be disconnected etc ). Is it true, that it's possible? If yes, please give a piece of advice, how should I repair it. Because I don't want to use TightVNC or other stuff. Thanks!

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• Sending a mail to gmail from my local mail server

  - by tambia

  I just configured a mail server and tried sending a mail to my gmail account with a local email I created with my mail servers dns. I didn't go well. I use redhat server and sendmail and the testing was done with evolution mail. I had the following error : "RCPT TO<[email protected]> failed: <[email protected]>... relaying temporarily denied. Cannot resolve PTR for my ip" How can I solve this?

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• How to get a subdomain to point a different server than the main domain

  - by alexchoi

  I have a site at say: foo.com and I would like the subdomain blog.foo.com to point to fooblog.com blog.foo.com - fooblog.com However, our DNS provider says that if we do an alias such as that, since the provider at fooblog.com does not recognize the name blog.foo.com. We asked if we could just point blog.foo.com at the IP address of fooblog.com and they say the same problem will occur. Any advice? Due to our configuration we can't really put the blog on foo.com. We are willing to move our hosting and even our domain name hosting if necessary. -- Yes, I am a n00b when it comes to DNS.

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• pfSense router gives DNS rebinding warning when accessing subdomains

  - by Richard Maddis

  I have just set up a router running pfSense on our network and forwarded the appropriate ports. I have a small web server running in my network, and a domain name pointing to our (WAN) IP. When accessing that domain name, everything works fine. However, when accessing a subdomain of the domain name, pfSense will give a DNS rebinding warning. This did not happen back when I used a DD-WRT router. What is the proper way to fix this? The DNS records for the subdomain also point to the same address (I use a virtual server to differentiate the subdomains.)

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• IE Search Provider: Specifying gTLD / Country-Specific Site

  - by jwa

  I am based in the UK, and as such typically use google.co.uk as my search engine. However, my employer is based in continental Europe, and thus my internet proxy is located overseas. As a result, IP geo-location presents a location outside of the UK. Google detects this, and as a result will redirect my searches from the address bar to a foreign Google domain. This leads to "local" answers having a higher ranking, many of which are not written in English language! Is there a specific search provider / URL I can give to IE which will use a specific gTLD of google (.co.uk), rather than performing the location-based redirect?

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• Confusion about DNS for mail server

  - by Tyron Gower

  We have migrated to Office365, everything is working except one company cannot email us as its connecting to our subdomains email server. So, We have companionsoftware.com.au hosted through office365 and all the required DNS entries. All seems to be working fine. We then have a web server hosting our website companionsoftware.com.au and our subdomain email attachments.companionsoftware.com.au (pop3/smtp). now for this one company when they try and email [email protected] it's connecting to STMP on attachments.companionsoftware.com.au. Now attachments.companionsoftware.com.au and companionsoftware.com.au have the same ip address, but this is only affecting one person (that we know of) when they try and email us. Have i configured something wrong or is it their server?

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• Why can't I access the WebUI of my DNS-323 NAS after a firmware upgrade?

  - by anonymous2

  Hi Everyone, I just bought a D-Link DNS-323 NAS Enclosure, and have run into a problem. I read that the firmware that had shipped with (1.07) did not support 2TB drives, so I downloaded firmware 1.08. Turned on the device for thwe first time and went straight to the WebUI (everything looked/worked fine) Proceeded with the firmware update, completed successfully. Rebooted and I cannot access the WebUI. I can see the NAS connected via my router interface I can also ping the ip adress assigned, but I cannot access the WebUI or find it via D-Link easy search software. I have tried the factory reset button, but that does not seem to be doing anything, the square blue light just keeps flashing from the moment the unit is powered on, whether I press the reset button or not, and the symptoms remain the same... PS. I did/do not have any drives installed yet. Please help?

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• How do I map a friendly name (e.g. www.example.com) to 127.0.0.1:port# on Mac OS X

  - by Fred Finkle

  I am trying to create a demo for a class of mine and I want to configure "fake" domain names on my laptop. A previous question "Can I specify a port in an entry in my /etc/hosts on OS X?" contained an answer indicating that to do it you must use /etc/hosts plus changes to the iptables "If OS X uses iptables you could point xyz.com to some ip in the hosts file like 157.166.226.25 and then: sudo iptables -t nat -A OUTPUT -p tcp --dport 80 -d 157.166.226.25 -j DNAT --to-destination 127.0.0.1:3000 " Since OS X doesn't use iptables, how do I do the equivalent using the tools available on OS X? (the original "asker" seemed to know how to do this, so it wasn't explained). Thanks in advance.

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• How to tunnel local port through proxy server?

  - by Joe Casadonte

  I have a non-proxy-aware program that I need to get working through an HTTP proxy server. The program (MYPROG) running on a machine I can configure at will (MYSRV) connects to a specific server (DESTSRV) on a specific port (DESTPRT). There is an existing HTTP proxy server (PROXYSRV:PROXYPRT) that will allow the traffic through if MYPROG was proxy-aware, but it isn't. Is there a way to listen locally on a specific port and forward the traffic through the proxy server? I can totally configure where MYPROG points to, so I could point it to MYSRV:4545 with the thought that some wonder program will redirect the data to DESTSRV:DESTPRT through PROXYSRV:PROXYPRT. I'm thinking IP Tables or netcat could do the trick if only I could figure them out... Thanks!

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• Linux server failover

  - by Lukasz

  I have two Linux servers (CentOS6) - both are identically configured connected to the same switch with a direct link between them. I only have one external IP that is assigned to eth0 on both servers (connected to the internet switch) with the interface shutdown on server 2. How can I failover to server 2 if server 1 dies - as stated they are linked directly so they can check for availability of each other via ping/tcp/udp. I toyed with Heartbeat but the documentation seems to be non-existent - not sure how to bring up an interface and start some services if the other server dies.

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• How can I redirect HTTPS(S) traffic to anothr gateway?

  - by PsyStyle

  I have a network like 192.168.0.0/15 with the default gateway set to 192.168.0.1. Al the workstations of the network use this gateway for all kind of accesses to the Internet. Now I am testing a new Internet connection with another provider and for this I am using a second gateway on the same subnet with 192.168.0.2 as IP address. I want to redirect only HTTP and HTTPS traffic to this second gateway without touching the address of the default gateway set inside every workstation. How can I accomplish this task? What I have to change inside the first's gateway firewall configuration or routes? I tried with a dnat like DNAT loc:192.168.0.1 loc:192.168.0.2 tcp 80 but nothing worked. I use Shorewall for simplicity in configuration but I can understand even theorical answers which I will try to adapt to my case

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• Connect to server in VMWare player while host is not connected to a network

  - by blockcipher

  Hello, I have a linux server VM on my host machine using VMWare player and if I'm on a network, I can connect to the web server on the VM via a web browser. However, I tried to do the same while I was disconnected from a network and I couldn't. The networking is set to Host-only and I did use dhclient/ifconfig to make sure that yes, I did have an IP address assigned to the VM. While I can work around this, the purpose of the VM is to allow us to demo our app from any machine and that machine may not be connected to a network. Thanks.

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• Ubuntu Wired network(ethernet does not work)

  - by user36777

  It was working just fine, until the other day I yanked it out. The wireless works just fine on the same router. If I login to a windows 7 instance on this dual boot laptop then the ehternet works just fine. So it's not a hardware, cable or router issue. The card even gets an ip, but I can't connect to the internet. Here are the details from route, iptables, ifconfig, ping etc. Any ideas? I have been struggling with this for day, none seems to have an answer. http://pastie.org/954816

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• Send Gmail emails from Facebook address

  - by Mikulas Dite

  Is it somehow possible to link Facebook address each username is given to Gmail? Obviously, there is the "Accounts, Send mail as" feature, but that used to return an error ... Final-Recipient: rfc822; [email protected] Action: failed Diagnostic-Code: smtp; 550 5.1.1 RCP-P2 http://postmaster.facebook.com/response_codes?ip=209.85.210.181#rcp Refused due to recipient preferences You have requested to add [email protected] to your Gmail account. Confirmation code: XXXXXXXX ... The XXX part is actually how the email actually reads, the daemon does in fact obfuscate the code prior to sending it back. I tried again recently, but Facebook mailer does not even return the error message nowadays (alas, it doesn't show in the message center either). So, is there a way to link those to services nowadays?

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• How can I re-create Microsoft Cluster Service resource groups on a different cluster?

  - by PersonalNexus

  I use Microsoft Cluster Service on a cluster of Windows Server 2003 machines containing several dozen resource groups. In the process of migrating to newer hardware, I would like move resources to the new machines on resource group at a time spread out over a few days to ease the migration and minimize risk. I was wondering of there was a smarter way to do this than manually re-creating resources on the new and then deleting them on the old cluster? The cluster has already been set up properly, the only missing is the resource groups and the resources they contain (IP, network names, services...). I have looked through the options of the cluster admin GUI and cluster.exe's commandline options, but haven't found anything like an import/export feature to copy over the configuration of a resource or entire resource group. Does something like this exist?

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• What is causing my wireless problems?

  - by user34629

  I have a Dell XPS M1330, since I moved to my new house, the wireless barely works on it, my housemates report no problems, so I guess it's something to do with my laptop. It's eratic in normal mode, sometimes not working for days, usually working on-and-off, forcing me to reload pages a few times before they work, etc. It works perfectly in safe mode, the driver I'm using is the Intel PRO/Wireless 3945ABG Network Connection, version 12.4.4.5, with a date at 26/10/2009, the most recent one I could find, bluetooth is not enabled, and I'm running Vista 32-bit Home Premium, which it shipped with. I also tried disabling IPv6 and resetting the IP stack, both to no avail. Can anybody help me?

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• Windows Load Balancing Services and File Shares

  - by cbkadel

  We are using Windows Load Balancing Services (WLBS). One of the things that I do notice, is that if I create a File Share on one of the physical hosts, I am able browse to that file share using the clustered-ip address. This might be a 'opinion' question, but I haven't been able to find much literature on file shares in particular with wlbs. Is this a recommendation configuration? Are there any limitations? What about when the share contains different sets of content on both hosts? For instance: Three 'hostnames' - host1 (physical1), host2 (physical2), and cluster. I create the following shares: \physical1\myshare \physical2\myshare What I notice is that i can see: \cluster\myshare I'm guessing that this is read-only, and that there's no file synchronization. But what happens if they are in fact out of sync, what would a network browser see then? Thanks for your time!

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• "No input file specified" - unable to access phpMyAdmin using debian squeeze

  - by guiltybyintent

  I have installed phpMyAdmin on my VPS LAMP server (Debian Squeeze/Apache2/MySQL/PHP5), but am unable to access it: //my-ip/phpmyadmin/ and //my-domain/phpmyadmin/ both produce the following error message: "No input file specified". The phpMyAdmin FAQ identifies this as a permission problem, but the suggested solution seems not to apply to my situation. Every other solution I have come across involves removing/purging and reinstalling phpmyadmin - which I have done several times, always to the same result. Previous posts in this forum typically relate to Nginx, which I have not installed. Thanks in advance for any help!

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