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• FortiGate firewall configuration with /30 and /28 networks

  - by slyderc

  I have fiber coming in from a new ISP which is being handed off via Ethernet on a single physical port. I'm having doubts about how to approach the configuration on my FortiGate 200A firewall because I've been given a /30 containing the ISP's gateway and another /28 for external IPs I can use: x.y.76.12/30 (.13 is the GW) x.y.76.64/28 (public IP space) How do I configure the FG200A's WAN1 interface to be aware of the two networks? As I only have one physical ISP port, will I need to plug it into a switch to break-out two cables and use a DMZ port on the FG200A for setting up the /28? Thanks in advance for your insight!

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• DNS server at router level vs. computer level

  - by Craig

  I've three questions. Is it better/faster/optimal to set up your server's preferred and alternate DNS servers in your OS's network settings or in your router settings? Will it cause problems if it is set up in both places, both pointing to the same IPs? I am running Windows and I have my network assign a static IP to one of my computers. This doesn't allow me to obtain the DNS server addresses from my router automatically. Is there an IP I can put in that will cause it to take the DNS server addresses from the router?

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• Mail server hammering

  - by Rodrigo

  I've noticed a quick increase on smtp connections coming to my server, investigating it further i figured out that there's a botnet hammering my smtp server. I've tried to stop it by adding a rule at iptables: -N SMTP-BLOCK -A SMTP-BLOCK -m limit --limit 1/m --limit-burst 3 -j LOG --log-level notice --log-prefix "iptables SMTP-BLOCK " -A SMTP-BLOCK -m recent --name SMTPBLOCK --set -j DROP -A INPUT -p tcp --dport 25 -m state --state NEW -m recent --name SMTPBLOCK --rcheck --seconds 360 -j SMTP-BLOCK -A INPUT -p tcp --dport 25 -m state --state NEW -m recent --name SMTP --set -A INPUT -p tcp --dport 25 -m state --state NEW -m recent --name SMTP --rcheck --seconds 60 --hitcount 3 -j SMTP-BLOCK -A INPUT -p tcp --dport 25 -m state --state NEW -j ACCEPT That would avoid them from hammering "too fast", however the problem still, there's like 5 tries per second, it's going insane, i had to incrase the maximum number of childs of sendmail/dovecot. There's too many ips to filter out manually and simply changing the smtp to another port is not practical since i got many other clients on that server. I'm using sendmail with dovecot, any ideas to have this filtered out more efficiently?

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• Rate-Limit affects All clients or single IP?

  - by Asad Moeen

  Well up-til now I've considered iptables rate-limit commands with the "recent" module to work for each IP Address. For example rate-limit rule of 20k/s will trigger only if a single IP exceeds 20k/s rate and not if 4 different IPs exceed 5k/s rate. Please correct me if I considered this wrong as I've only used these rules for TCP/ UDP. But today I tried similar rules for ICMP and applied 4/s Input/Output. But then on trying to ping-test from just-ping.com I could see packet loss on almost all IP Addresses. How could that happen because if it worked for each IP Address then it wouldn't be triggering the rule because I believe each IP from just-ping has a rate of probably 1/s. I still think the first one is true because if it wasn't then my GameServer would block everyone if the combined rate ( in case of more connected players ) increased the threshold. This hasn't happened up til now so the ICMP thing really confused me. Thank you.

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• website not accessible with IIS6 while NAT is configured in Windows 2003

  - by Mohammed Rizwan

  I have Windows2003 server configured with IIS 6. Until now it was working fine, but since I enabled NAT for my users to access the internet via this server, the website becomes unavailable. Note that I have two nics on the server one is WAN and 2nd is for LAN. Both IPs are behind the firewall. If I stop the NAT then the website is available externally. I tried to search the answer in this forum but didn't find appropriate one or maybe didn't properly understand. I'll appreciate if anyone can help me sorting out this issue.

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• I got these strange messages on my websites feedback form?

  - by Ali

  Hi guys - I got all of a sudden a number of strange feedback messages from my sites feedback form its where normally users would come and enter feedback and then I would review it on an admin panel. However these messages make little to no sense like for an example: here are two 'messages': 2GyOim <a href=\"http://vdjzpnoyzfji.com/\">vdjzpnoyzfji</a>, [url=http://gixlpbtswcdh.com/]gixlpbtswcdh[/url], [link=http://zudauexgjgot.com/]zudauexgjgot[/link], http://vqhafprwogyf.com/ jF2wdU <a href=\"http://aprjkscbhnxf.com/\">aprjkscbhnxf</a>, [url=http://dhfeoqufoqvu.com/]dhfeoqufoqvu[/url], [link=http://whmzpbqrsume.com/]whmzpbqrsume[/link], http://xxfntqzhhbza.com/ I got about over a dozen of these - and they are all from very different ips is someone playing around and is it a cause for me to get vigilant?

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• How do I force .htaccess authorization to occur over ssl?

  - by kenja

  I'm trying to force a particular directory to require only allowed IPs and a valid username/password through basic authorization. To ensure that the username/password are sent in encrypted form, I want the directory to also force SSL use. Here is what I have in my .htaccess file: # Force HTTPS-Connection RewriteEngine On RewriteCond %{SERVER_PORT} !^443$ RewriteRule (.*) https://www.mywebsite.com%{REQUEST_URI} [R,L] ## password begin ## AuthName "Restricted Access" AuthUserFile /var/www/admin/.htpasswd AuthType Basic Require valid-user Order deny,allow Deny from all Allow from 79.1.231.151 62.123.134.83 Satisfy All Unfortunately, when I access that directory using http protocol, it is asking for the password before it redirects the page to the secure version. This means the password is sent unencrypted. What am I doing wrong? Is there a way to do this?

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• Is span monitoring on Cisco ASA 5520 possible?

  - by Brent

  From what I have read, you can use the switchport monitor command on ASA 5505's to setup a Span port due to the back of the ASA actually being a switch. On my 5520, I do not see the switchport command listed when issuing a ? via the CLI. How do people monitor traffic on non-5505's? My goal is to connect our IDS/IPS device that is running is promiscuous mode to a Ethernet port on the 5520 to monitor WAN traffic. I do not want to have to pass the WAN traffic through a switch as it would require me to get two (for redundancy) STP/switchport capable switches. Guide to setting up switchport access on a 5505: http://www.wr-mem.com/?p=66

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• windows 7 losing wired ethernet connection

  - by Brandon Grossutti

  i have a win 7 machine with an Atheros L1 Gigabit Ethernet 10/100/1000Base-T Controller with latest drivers, the machine is upto date with all latest fixes etc. I have it connecting to a WRT310Nv2 router. Seemingly random, win 7 disconnects from the "Home Network" says its in a "public network", then resets the connection to an illegal 169 address. I have tried static ips, dhcp, all with the same results. This seems to have started shortly after i installed Vuze, so I uninstalled it but the problem persists. I know that the router is sound given that I have an XP machine attached with no issues of connectivity at all. I am at a complete loss and have tried everything, pleasse tell me i'm not the only one.

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• windows 7 losing wired ethernet connection

  - by Brandon Grossutti

  i have a win 7 machine with an Atheros L1 Gigabit Ethernet 10/100/1000Base-T Controller with latest drivers, the machine is upto date with all latest fixes etc. I have it connecting to a WRT310Nv2 router. Seemingly random, win 7 disconnects from the "Home Network" says its in a "public network", then resets the connection to an illegal 169 address. I have tried static ips, dhcp, all with the same results. This seems to have started shortly after i installed Vuze, so I uninstalled it but the problem persists. I know that the router is sound given that I have an XP machine attached with no issues of connectivity at all. I am at a complete loss and have tried everything, pleasse tell me i'm not the only one.

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• How do I host multiple SSL websites on a single EC2 instance using Amazon Elastic Load Balancers?

  - by Developr

  If I have 3 separate websites which all require SSL (separate certificates) that I want to host on the same EC2 instance(s) across multiple availability zones so that we have the ability to scale and be highly available, how do I achieve this using ELBs in my Amazon VPC? Each site requires a separate IP address, so I have added multiple private IPs to the EC2 instance, but I am unsure how to bind the ELB to a certain IP on the instance. I was also able to setup multiple ELB pointing to the same instance, but again, I am not seeing any way to bind each ELB to a separate IP on the instance. If this is not possible, what is the best option? Run each site on a separate EC2 instance / ELB combo (expensive and harder to maintain) Give each site a separate public IP and use Route 53 to do the load balancing (seems like a hack) Use a different load balancer option such as HAProxy that should be able to work like a normal load balancer appliance. Please help!

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• Routing to a Terminal Services Cluster

  - by Dave

  I am trying to connect to a Load Balanced Windows 2008 R2 cluster using Remote Desktop Services. I have no trouble connecting to the the Servers' IP addresses (.253.16 and .253.17) or the Cluster address (.253.20) from inside the subnet (.253). The trouble is when I try to connect from the other subnet(.251). I can remote to the other non-clustered servers (.253.12 and .253.15) inside the .253 subnet from the .251 without an issue. I receive a ping reply from the cluster and other servers when I am on the .251 subnet. But when I try to connect via remote desktop it times out but only to any of the IPs on the cluster (.20,.17,.16). My ASA 5510 handling the routing reports message in the log: Deny TCP (no connection) from 192.168.251.2/4283 to 192.168.253.16/3389 flag FIN PSH ACK Here is a picture if it helps http://dl.dropbox.com/u/4217864/terminal%20server.jpg Thanks for any help

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• Mac Parallels - Bridged network

  - by Jack

  I am new to Apple and my task is to install VMs on a Mac server. I am trying to install 4 VMs and I want them to have separate IPs and be visible on the network as separate machines. What are my options? My research shows me that I can use a bridged network, but I have to select an adapter. I have only two network adapters, does that mean I can only have 2 VMs? And when I configure the 2 VMS, will my actual server have internet connection? Or does it use the Mac's address?

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• SBS 2008 DNS issues in BPA

  - by evesirim

  I'm gettng constant Critical Issue events in the Small Business Server Best Practices Analyser & resulting SBS Console reports that begin "The DNS client is not configured to point only to the internal IP address of the server.". When I check the DNS Manager, there are two separate IPs listed, one ***.***.***.2 and the other ***.***.***.28. I have checked online after an ipconfig /all and have found the reason for this to be that the second IP is created by DHCP for RAS & VPN purposes. It seems to cause no conflicts of any detrimental result apart from constantly sending me error messages and alerted reports. Does anyone know of a way that I can change settings somewhere so that Windows accepts this second IP, or at least stops alerting me of its prescence? Perhaps a registry hack of some kind...? Many thanks in advance

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• Netsh commands not working on remote computer

  - by Mike Christiansen

  Hello, At work, we are in the process of migrating over 200 computers from static IPs to DHCP. The DHCP server is configured. My biggest hurdle is physically going to every single computer in the area and configuring them all for DHCP. I am trying to use netsh to accomplish this. However, I cannot even seem to set one computer to DHCP remotely. The command I am trying is: netsh -r COMPUTERNAME interface ip set address name="Local Area Connection" source=dhcp netsh -r COMPUTERNAME interface ip set dns name="Local Area Connection" source=dhcp This results in the error The following command was not found: interface ip set address "name=Local Area Connection" source=dhcp. Any ideas?

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• IP Forwarding and Routing in Windows 2008

  - by Danialzo

  I have Hyper-V running on a windows 2008. I got a new ip stack from the data center to be set on my virtual machines. But I have difficulties to set these IPs on my VMs because they are on different network. my current server ip is xxx.xxx.18.6 with MASK : 255.255.255.224 and the GW is xxx.xxx.18.1 my new ip stack is xxx.xxx.168.176/29 I can use RRAS to achieve this. Do I need to create another NIC? How do I make these VMs reachable from outside?

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• 3CX behind UT7.1 using a callcentric.com SIP account

  - by Corey

  Has anyone had any luck with getting 3CX working behind UT7.1 with a SIP account from callcentric.com? I am willing to reset my current UT box back to defaults, and start from there. I have a static public IP assigned to the external interface. My internal addressing is 192.168.76.0 . My 3CX box has 192.168.76.17 . Would anyone be willing to give me a step by step of changes to make in UT / 3CX. I currently have my UT box unplugged, and have replaced it with a Linksys unit. I have port forwarding setup for… TCP/UDP 5060 to 192.168.76.17 UDP 9000-9049 to 192.168.76.17 … and everything works great. I also have additional external IPs available if that helps.

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• Apache not using the right SSL certificate [on hold]

  - by user2420318

  In my apache2 setup, I have one VirtualHost for my main site, and another for a static content site, like downloads, css, etc. I have ssl certificates for both, and the static content one is under a subdomain of the main site. I have configured the four virtualhosts altogether, as both sites need SSL ones as well. When I only had 1 SSL site, everything was OK, but now with the second, the first site uses the second site's certificate, even though it is told specifically to use its own in the VirtualHost section. I honestly have no idea why apache would do this. Any ideas? I have a feeling there may be some default/global setting or something that are set for some odd reason. I am using different IPs for the Virtual hosts.

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• [SOLVED]Need help with remote dekstop - Limit the computers you can access server from

  - by stirredo

  I have a windows server 2003 computer that is accessed by remote desktop connection. To access the server all you need to know is the IP address of the computer. I want to limit the computers that can access the windows server computer to authorized computers only. The authorized computers won't have static IPs, so I cannot limit them on basis of IP address. Can I limit them on basis of MAC id perhaps? I won't mind using third party solution like Teamviewer or Logmein etc. So How can I solve this problem? EDIT: Found a possible solution in team viewer. Team viewer creates a unique partner ID for the computer it is installed on. It has an option for allowing only authorized partner IDs to access the computer. Problem solved.

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• "This computer has dynamically assigned IP addresses" error when installing Active Directory Domain Controller

  - by smhnaji

  This is a working Windows Server 2008 that I should install Active Directory on it. I found http://www.howtogeek.com/99323/ and followed the steps. After Additional Domain Controller Options, I'm asked the question "This computer has dynamically assigned IP addresses". As I see, the message states that Dynamic IP addressing has been used for the server, while this is wrong. When I come to Network And Sharing Center, and click on Local Area Connections - Properties - Internet Protocol Version 4 (TCP/IPv4) - Properties, I see that the main IP address (as well as DNS Server) and also all other IP addresses are assigned statically. So it should be OK. I cannot believe any server using dynamic IP(s)! Note: No IPv6 has been set for the server. Please tell me why the error is given and which of the options available, should I choose? Note that it's a production server and is working with many users in WORKGROUP. No change should be affected nor to the IPs, neither to users connecting to the server.

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• Tomcat - virtualhosting - name / ip / port - based

  - by lisak

  Hey, what are the usage scenarios for these kinds of virtual hosting ? Name Based - typical tomcat virtual hosting, one HOME instance with many contexts, each as an individual host IP based / port based - multiple instances of tomcat ( how is it with performance and memory consuption?) running on IP aliases (virtual IPs) for one network adapter, usually behind http apache server that can run name based virtual hostings. Otherwise I can't figure out how would I forward requests in iptables/firewall based on IP address, which is just one. How is IP based virtual hosting done as to Tomcat and multiple instances ? I'd like to hear some usage scenarios from your experience. How are you running your applications. Cause there are applications having it's own modified classloader and they are developed in a way to run alone withing a tomcat instance. Then there are trivial applications which can run within one instance without problems. Many thanks

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• Get sessions' remote IP from Teamviewer log file

  - by etuardu

  I'd like to know who has logged in to my machine and when. I have two TeamViewer log files: Connections_incoming.txt and TeamViewer7_Logfile.log. The first one is quite plain and lists, as its name says, the incoming connections to the machine, reporting the local name of the remote host, login time, logout time, and some ids. e.g.: 173274362 MYLAPTOP 20-02-2012 17:32:16 20-02-2012 17:50:42 Master RemoteControl {C5AAE483-ED0B-54B8-9235-7AE597CAD342} This is almost all what I need, but unfortunately no remote IP address is reported here, so I checked for IPs in TeamViewer7_Logfile.log but it is really messy. It indeed contains some IP addresses but I can't understand which one is bound with the items in the first log file. Is there a way to interpolate the two logs to get what I need? Should I search the second file for some particular text? What do you suggest?

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• associate dhcp requests with subdomains in dnsmasq

  - by Dezra

  I have dnsmasq running as a dns server with a number of linux boxes using static ips that run several virtual hosts on subdomains. I currently have the following address line in my dnsmasq.conf to map the subdomain of a boxes address to the boxes static ip: address=/.devbox1.mydomain.com/192.168.1.3 address=/.devbox2.mydomain.com/192.168.1.4 e.g. site1.devbox1.mydomain.com > maps to devbox1 static ip, site1 virtual host site2.devbox1.mydomain.com > maps to devbox1 static ip, site2 virtual host site3.devbox2.mydomain.com > maps to devbox2 static ip, site3 virtual host I was wondering if I can change the machines over to DHCP addresses (instead of static) and have dnsmasq use the dhcp ip instead of the static one? Can I modify the address line to refer to the DHCP address (obviously, I cant hardcode the address)? I know I could add mac address to ip allocation, but I want to avoid this if possible.

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• Postfix - Unable to receive emails from certain domains

  - by Emmanuel

  Got a Postfix-Dovecot-Saslauthd setup on Ubuntu 10.04. Problem is there's (at least) one domain that it refuses to accept emails from. I've been getting emails fine from lots of different domains except one. It's really weird, but could some config file or something be blocking certain domains? or IPs? or something? I know the emails are being sent to me, infact I sent a test one myself from this domain and they're just not showing up.

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• haproxy - pass original / remote ip in tcp mode

  - by Vito Botta

  I've got haproxy set up with keepalived for load balancing and ip failover of a percona cluster, and since it works great I'd like to use the same lb / failover for another service/daemon. I've configured haproxy this way: listen my_service 0.0.0.0:4567 mode tcp balance leastconn option tcpka contimeout 500000 clitimeout 500000 srvtimeout 500000 server host1 xxx.xxx.xxx.xx1:4567 check port 4567 inter 5000 rise 3 fall 3 server host2 xxx.xxx.xxx.xx2:4567 check port 4567 inter 5000 rise 3 fall 3 The load balancing works fine, but the service sees the IP of the load balancer instead of the actual IPs of the clients. In http mode it's quite easy to have haproxy pass along the remote IP, but how do I do in tcp mode? This is critical due to the nature of the service I need to load balance. Thanks! Vito

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