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  • How should I choose my DNS?

    - by Jader Dias
    When I have to choose my DNS I think that I should consider: Speed Reliability Privacy Control (reports and stats) The main options that come to my mind, and how I weigh them according to the above factors, are: My ISP = faster (closer to me) but less privacy (they can associate my DNS requests to myself) OpenDNS and such = more control and more privacy (all they have is one of my e-mail addresses) Google = less privacy (they can associate my DNS requests to my Google Account and my searches) What weighting factors, or other options, have I missed?

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  • how to check open ports of bunch of website at once with nmap/linux?

    - by austin powers
    hi , I want to use nmap in such a way that I could check bunch of server's port at once for checking whether their particular port is open or not? right now I have 10 ip addresses but in future this could be more . I know the very basic command in linux like cat/nano/piping but I don't know how can I feed to nmap the list of my servers to open them one by one and return the result.

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  • Using google apps mail with my existing gmail account

    - by Barney White
    Please help!, Here is my situation: I've been doing business using my current gmail address ([email protected]) and really wanted my mail address to read [email protected], so i looked into google apps. It says you can set up custom emails with your domain name, achieving the above goal, but how do i configure these addresses to run through my CURRENT gmail account? I have everything pretty well set up, and it would be very time consuming to effectively start again...Any help would be greatly appreciated. Many thanks. Barney

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  • Windows Server 2008 Stnd - Wins Issue Possibly???

    - by DevNULL
    Currently we have a freshly setup Windows Server 2008 server acting as DNS and AD,Print and File server. I setup VPN and routing services and was able to successfully connect through VPN however I can't resolve any host using NETBios names. Only IP addresses. Sounds like I need to add a role for WINS but since this is a LIVE environment I'm a little hesitant about adding and removing additions to the box. What would I need to do to resolve this issue?

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  • Elastic Beanstalk and IIS logs

    - by user195744
    I have an ELB app and when logging into an instance and looking at the IIS logs I see something like the following: 2013-10-18 17:14:25 10.240.27.2 GET /FSViewer/Img.aspx trcid=451847431&vhtid=391833142 80 - 10.210.107.159 Mozilla/5.0+(compatible;+MSIE+10.0;+Windows+NT+6.1;+WOW64;+Trident/6.0) 200 0 0 140 The 10.240.27.2 address always repeated, which is the load balancer? So how do I find out the IP addresses that are hitting my server?

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  • OpenVPN multiple servers on the same subnet, high availability

    - by andre
    Hey everyone. Let me start by saying that my Linux experience isn't super awesome but I can usually find my way around things easily. Over at work we have an OpenVPN setup that's been due for some improvement for a while now. The main server (tap mode) runs in our office, behind a rather slow DSL connection. The main problem is that, since I'm usually out of the office, every time I want to access something on the virtual network I have to go through that server to get anywhere else. We have two servers up on 100 Mbit connections that we use for development and production purposes, about 3 more servers in the office (one of them behind a different T1 line for VOIP) and about two dozen clients who use the network on a daily basis from various locations. We've had situations where network routing (outside of our control) would not allow people to reach our main OpenVPN server whilst the other locations were connectable. Also any time someone outside the office wants to fetch something from any of the servers (say, a 500 MB code repository), a whopping 20 KB/s download speed is just unacceptable these days (did I mention slow DSL? ok). We had to implement traffic shaping on this server since maxing out this connection was fairly trivial. I had the thought of running two (or more) OpenVPN servers in the network. These would have to have the same subnet though, as our application relies on virtual network's IP addresses for some of its core functionality. The clients would also preferably retain the same IP addresses but that's not vital. For simplicity, lets call the current server office and the second server I'm setting up, cloud. Call the server on the T1 phone. This proved to be rather complex because as soon as I connect to cloud, I cannot see office. Any routes to a server that would go through office also do not work while I'm connected to cloud (no ping, nothing) and vice-versa. There's no rules for iptables that would be blocking the traffic either. Recently I came across this article on linuxjournal but the solution they provide seems to only cover the use of two servers and somewhat outdated (can't even find much documentation, their wiki is offline). They also state that adding more servers would be a complex task. Ideally I would like to keep the existing server office running the virtual network and also run the OpenVPN daemon on the cloud and phone servers (100 Mbit and very reliable connection, respectively) so that we're on safe ground in case of a hardware failure, DSL failure, etc. So, in essence, I'm looking for a highly available OpenVPN solution (fix, patch, hack, tweak, whatever you want to call it) that will accept connections on multiple hosts (2 or more) whilst keeping the same IP address subnet regardless of the server to which you connect to. Thanks for reading and sorry for the long post, I hope it gets the point across :P

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  • DNS pointing to different IPs from different parts of the world

    - by David
    I have a domain name that for some reason is pointing to different servers depending on where you are located in the world. What is odd is that I have another domain that has the same DNS servers, which points to the same server regardless of your location (which is the way it's mean't to work). Any ideas why the first domain is pointing to different IP addresses for different people?

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  • Preventing 'Reply-All' to Exchange Distribution Groups

    - by Larold
    This is another question in a short series regarding a challenging Exchange project my co-workers have been asked to implement. (I'm helping even though I'm primarily a Unix guy because I volunteered to learn powershell and implement as much of the project in code as I could.) Background: We have been asked to create many distribution groups, say about 500+. These groups will contain two types of members. (Apologies if I get these terms wrong.) One type will be internal AD users, and the other type will be external users that I create Mail Contact entries for. We have been asked to make it so that a "Reply All" is not possible to any messages sent to these groups. I don't believe that is 100% possible to enforce for the following reasons. My question is - is my following reasoning sound? If not, please feel free to educate me on if / how things can properly be implemeneted. Thanks! My reasoning on why it's impossible to prevent 100% of potential reply-all actions: An interal AD user could put the DL in their To: field. They then click the '+' to expand the group. The group contains two external mail contacts. The message is sent to everyone, including those external contacts. External user #1 decides to reply-all, and his mail goes to, at least, external user #2, which wouldn't even involve our Exchange mail relays. An internal AD user could place the DL in their Outlook To: field, then click the '+' button to expand the DL. They then fire off an email to everyone that was in the group. (But the individual addresses are listed in the 'To:' field.) Because we now have a message sent to multiple recipients in the To: field, the addresses have been "exposed", and anyone is free to reply-all, and the messages just get sent to everyone in the To: field. Even if we try to set a Reply-To: field for all of these DLs, external mail clients are not obligated to abide by it, or force users to abide by it. Are my two points above valid? (I admit, they are somewhat similar.) Am I correct to tell our leadership "It is not possible to prevent 100% of the cases where someone will want to Reply-All to these groups UNLESS we train the users sending emails to these groups that the Bcc: field is to be used at all times." I am dying for any insight or parts of the equation I'm not seeing clearly. Thank you!!!

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  • Unmanaged Network Switch vs Managed Network Switch

    - by David
    Currently I have an unmanaged POE switch connected to a Linksys router. I am thinking of upgrading my POE switch to a gigabit POE switch, the only problem is that the switch that I want to get is a managed switch. So here's my question: with a managed switch, can I still connect all of my devices to it and have the devices request IP addresses from the DHCP server within the Linksys router or will the devices request IPs from the managed switch since I believe the switch has its own DHCP server as well?

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  • Convert IP Address format from ForeFront Firewall logs with SQL

    - by TrevJen
    I am trying to query IP addresses from Forefront Firewall logs, and I am a little stuck on the IP formatting C0A8E008-FFFF-0000-0000-000000000000 Can anyone give me the MSSQL command to turn this into standard human redable? UPDATE, I now see that I kust need to convert the first 8 charecters from hex to decimal....which I can then convert to IP. the trick is to parse those first charecters from the field with SQL

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  • Second network card configuration not working.

    - by Sebas
    I have 4 servers running Centos 5. All of them have two ethernet network cards. I have configured 192.168.1.x IP addresses on their eth0 card. They are all connected to the same switch using their eth0 card and they are all working. I have configured 10.72.11.x IP addresses on their eth1 card.They are all connected to the same switch - a different one from the switch used with eth0 card - using their eth1 card and they are NOT all working. Their configuration files is like: DEVICE=eth1 BOOTPROTO=static IPADDR=10.72.11.236 BROADCAST=10.72.11.191 NETMASK=255.255.255.192 NETWORK=10.72.11.128 HWADDR=84:2B:2B:55:4B:98 IPV6INIT=yes IPV6_AUTOCONF=yes ONBOOT=yes The interfase is starting and configured as I need. [root@sql1 network-scripts]# ifconfig eth0 Link encap:Ethernet HWaddr 84:2B:2B:55:4B:97 inet addr:192.168.1.105 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::862b:2bff:fe55:4b97/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2981 errors:0 dropped:0 overruns:0 frame:0 TX packets:319 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:386809 (377.7 KiB) TX bytes:66134 (64.5 KiB) Interrupt:36 Memory:da000000-da012800 eth1 Link encap:Ethernet HWaddr 84:2B:2B:55:4B:98 inet addr:10.72.11.236 Bcast:10.72.11.191 Mask:255.255.255.192 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 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:48 Memory:dc000000-dc012800 I also added a route-eth1 file that looks like: 10.0.0.0/8 via 10.72.11.254 Routing looks fine to me: [root@sql1 network-scripts]# netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.72.11.192 0.0.0.0 255.255.255.192 U 0 0 0 eth1 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 10.0.0.0 10.72.11.254 255.0.0.0 UG 0 0 0 eth1 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 But I cannot ping one server from the other. [root@sql1 network-scripts]# ping 10.72.11.235 PING 10.72.11.235 (10.72.11.235) 56(84) bytes of data. From 10.72.11.236 icmp_seq=1 Destination Host Unreachable From 10.72.11.236 icmp_seq=2 Destination Host Unreachable From 10.72.11.236 icmp_seq=3 Destination Host Unreachable From 10.72.11.236 icmp_seq=4 Destination Host Unreachable From 10.72.11.236 icmp_seq=5 Destination Host Unreachable From 10.72.11.236 icmp_seq=6 Destination Host Unreachable ^C --- 10.72.11.235 ping statistics --- 7 packets transmitted, 0 received, +6 errors, 100% packet loss, time 6033ms , pipe 3 What am I doing wrong?

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  • Is it worth the effort to block failed login attempts

    - by dunxd
    Is it worthwhile running fail2ban, sshdfilter or similar tools, which blacklist IP addresses which attempt and fail to login? I've seen it argued that this is security theatre on a "properly secured" server. However, I feel that it probably makes script kiddies move on to the next server in their list. Let's say that my server is "properly secured" and I am not worried that a brute force attack will actually succeed - are these tools simply keeping my logfiles clean, or am I getting any worthwhile benefit in blocking brute force attack attempts?

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  • IP address times out

    - by Werner
    I'm running a dedicated server with a couple of game servers running on 4 different IP addresses. The most network-heavy server times out a few times during peak hours and all other communication (FTP/SSH) through the same IP also briefly times out. Other servers using other IPs are fine and unaffected as well as FTP/SSH using other IPs. The server is running Debian 6. What causes this, and is there anything I can do?

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  • How to find username on remote computer?

    - by Neil
    I have the IP addresses of some computers on my network. Is there any command line tool like PsExec, which can take the IP Address as input and find out the username of the currently logged in user? I can install stuff on my workstation, but not the others. I can also run Metasploit / NMap / any other such program on my workstation.

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  • Divide a network into two subnets of equal size

    - by kylex
    I have been given the following IP 192.168.14.137/25 and asked to divide the network into 2. This is what I've come up with: The subnet mask is therefore 255.255.255.128 The network address is 192.168.14.128 There are a total of 128 available addresses (including the network address and broadcast address) To divide the network we create to subnets: 192.168.14.128/26 192.168.14.192/26 This will have a subnet mask of 255.255.255.192 Am I missing anything, or is this correct?

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  • How is DNS used by individual processes?

    - by atroon
    When resolving FQDNs or machine names to IP addresses on my local network (mycompany.internal) I can use dig on the command line (linux/mac) or nslookup (windows) to query the configured server and get a response. But trying to enter the FQDN or even just the machine name in a ping command or in a web browser results in 'Unknown Host' or DNS errors. Here's a sample, this one from the Mac: mac:~ atroon$ dig server.mycompany.internal ; <<>> DiG 9.6.0-APPLE-P2 <<>> server.mycompany.internal ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5219 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;server.mycompany.internal. IN A ;; ANSWER SECTION: server.mycompany.internal. 1200 IN A 172.16.254.36 ;; Query time: 0 msec ;; SERVER: 172.16.254.8#53(172.16.254.8) ;; WHEN: Wed Dec 16 11:39:15 2009 ;; MSG SIZE rcvd: 55 mac:~ atroon$ ping server.mycompany.internal<br> ping: cannot resolve server.mycompany.internal: Unknown host I cannot for the life of me figure this one out. The DNS server is a SBS 2003 box which handles AD, some file/print, etc for a small company network. This issue happens to me about three times a week, and when I'm connected to the local network directly, the same switch as the server even. I can make any connection I want with IP addresses, I just can't make DNS work. Additionally, at the same time I'm experiencing this, other users are fine, which makes me think it's a problem on my Mac. But what sort of problem? How can dig send a query and get a reply, and ping say 'unknown host'? I'm posting here vs. serverfault because I think this is a local problem not a server problem...but if anyone can point me at the server, I guess we'll head down the street a domain or two.

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  • Looking for a reliable Personal VPN Service

    - by user38673
    I am looking for a reliable personal VPN service so that I can access sites like Pandora or Hulu even when I am not physically in the US. I have been using StrongVPN but their service is not reliable. Here are some of my key requirements: Fast Reliable I don't mind paying a reasonable fee Unlimited traffic I just need PPTP support US IP addresses No software installation needed Supports Mac Any recommendations? Thanks.

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  • Determine the percentage of a file that has been ftp'd from client to server

    - by klwillie
    I want to ftp a large file from a Windows client to a Windows server, using their IP addresses. This is on an internet independent network. While the file is transferring, I would like to determine how many bytes have been received by the server. I then would like to use this information to determine in real-time the percentage of the file that has been transferred to the server. Any recommendations as to the ftp command syntax and C# code to achieve this?

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  • Sending a UDP message to a computer inside a network

    - by Dan
    Say I have the ip and mac address of a computer inside a network and I wish to send him a UDP message. By initializing the mac and ip addresses of the sent message to the given, when the network router recives the message he should pass it to the computer with the same mac address...right? Im asking becuase a program I write dosent seem to handle this limitation. it works great when its on the same network, but otherwise ...nada. Thanks

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  • Assign a secondary IP address to a Windows machine using DHCP

    - by IndigoFire
    Is it possible to configure dhcpd (on a Linux box) to assign a Windows PC 2 separate IP configurations? Right now I've configured the two IP addresses manually and it does exactly what's needed, but I can't figure out how to achieve the same thing with DHCP. For example, is it possible to set up a virtual interface that piggy-backs onto the first interface and gets its own configuration? Alternatively, is it possible to run a script upon getting IP values from DHCP that would then be able to configure the secondary IP?

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  • Discover all websites that point to an IP address

    - by crn
    Our company owns over 60 domains and a few external IP addresses (several domains share an external IP address). How do I discover all the domains that use a particular IP address (e.g. 69.x.x.7) without going through the DNS information on each domain? The particular webserver is running Windows 2003 and IIS6. Thanks, in advance, for your help!

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  • SNMP Traps: Telling the difference between sources

    - by MHibbin
    I am logging all incoming SNMP traps to file, for further processing, via: snmptrapd -Lf /path/to/my/file.log So this will log all traps coming in on port 162. Is there a way I can tell the differences between different sources, i.e vendors. I believe this would be the "OID" field but i'm unsure. Any thoughts would be welcomed, if not I will just have to use a lookup with IP addresses, but I'm sure I saw that there is a unique part to each vendor. Cheers

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  • How to use aliases for remote hosts when accessing locally

    - by alexloh
    I would like to use an alias for a remote host. For example, when instead of "ping giraffe.foo.bar.com" I want to do "ping giraffe", but only when I do it from my own machine. I am able to do this for raw IP addresses by adding an entry in /etc/hosts (ie "123.456.1.0 giraffe"), but it does not seem to work for host names.

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