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• Safe to use high port numbers? (re: obscuring web services)

  - by sofakng

  I have a small home network and I'm trying to balance the need for security versus convenience. The safest way to secure internal web servers is to only connect using VPNs but this seems overkill to protect a DVRs remote web interface (for example). As a compromise, would it be better to use very large ports numbers? (eg. five digits up to 65531) I've read that port scanners typically only scan the first 10,000 ports so using very high port numbers is a bit more secure. Is this true? Are there better ways to protect web servers? (ie. web guis for applications)

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• Junk host name while using nslookup, How to change it?

  - by Jayachandran

  Hi, My question is regarding the host name mapped to a machine's IP. I am new to Linux, I have a machine to test whether our j2ee based web application runs fine in linux box. we are able to deploy our application and successfully and even able to access the same in that machine. But when I tried accessing it through another machine in the same network, I am not able to access the URL using the hostname specified, instead I am able to access if I provide the ipaddress. I tried putting nslookup MyIP# command to know the name of the ip in the DNS server, where I got some junk value.com; when I tried to access with that name I am able to access the machine. Kindly provide me inputs to change the hostname of this machine in that domain server. Thanks in Advance!! Jay

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• iPhone VPN to iTunes Home Sharing [migrated]

  - by Philip Crumpton

  my goal is to set up a VPN on a Windows machine that contains my iTunes library then connect to that VPN with my iPhone and be able to utilize Home Sharing remotely. I have read that this can easily be set up if the iTunes library is on a Mac (Network Beacon and YazSoft ShareTool are two products I quickly found). I can't find anyone who has had success on a Windows machine, though. In my thinking, there are two options (aside from buying a Mac): 1.) Existing utility that takes care of this for me (like the Mac-only options listed above) and is compatible with iPhone (Hamachi is NOT compatible with iPhone VPN) 2.) Manually configure a VPN to allow Bonjour multicast (can't find any information on this) FYI my router is a Linksys WRT54GL running Tomato 1.28

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• How can I tell if a host is bridged and acting as a router

  - by makerofthings7

  I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is configured correctly. What IP, ICMP, or SNMP (etc) tricks can I use to poll the hosts and determine if the host is acting as a router? I'm assuming this test would presume I know the target IP, but in a large network with many subnets, I'd have to test many different combinations of networks and see if I get success. Here is one example (ping): For each IP in the DMZ, arp for the host MAC Send a ICMP reply message to that host directed at an online host on each subnet I think that there is a more optimal way to get the information, namely from within ICMP/IP itself, but I'm not sure what low level bits to look for. I would also be interested if it's possible to determine the "router" status without knowing the subnets that the host may be connected to. This would be useful to know when improving our security posture.

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• Print Managment

  - by nardone25

  Hello everyone, I am having a ID10T error LOL,. First I am using window server 2003 r2 edition. I installed on a domian controller print managment. So this is where all 48 printers I have are installed. I just got a new printer. I gave it an IP for the machine and when I head into the server room i tried to add it to the server. I can print a test page, when I am logged on to the print server, but on my client computer when he goes to add a printer in window xp pro the printer isn't listed in add print for network. What did I do wrong?

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• Does connecting to the default host via public IP from within its subnet cause any issues?

  - by username

  I'm setting up a small office network with a single public IP (let's say it's 69.16.230.117). I've configured NAT on the router with incoming traffic forwarded to the server (say the server has a private IP of 192.168.0.2). Is it okay to configure the client machines on the same subnet to access the server via the router's public IP (69.16.230.117)? In practice it's never caused me problems, but I've heard, here and there, that it is a bad idea, and one should use the private IP (192.168.0.2). Does connecting to the default host via public IP from within its subnet cause any issues? Please refrain from writing "never! it breaks the intranet!" ;-)

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• Windows HOSTS File

  - by jdp

  I have a network of computers and a server. I often need to edit the hosts file of all the computers to add a new entry or to change one. e.g. 192.168.1.101 temporary-internal-site How can I get all the machines (all windows) to 'import' or use a hosts file on a server in addition to the normal one. This means that I can just edit this one file with the new entry and all the machines will check it. Feel free to ask questions if you don't understand.

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• Open source monitoring tool without sending data to "Their Server"

  - by hangu

  I trying to use open source server monitoring tool. I know there are a lot, but I couldn't find what I need.. the basic process of monitoring tool I used to use before was, 1) Install agent in my server which I want to monitor 2) The agent send data to "their server" 3) I can check the health of my server through web browser presented by them. What I need is, avoiding "Step 2". Are there any monitoring tool that I can use? I have Windows 2008 and Linux servers simple feature will be enough like (CPU, Memory, Network..) Thank you

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• Issues connecting VMWare VM to Windows 7 (host)

  - by MasterGberry

  I am on windows 7 trying to figure out why i cannot ping my computer or my VM from the other one, yet I am able to ping the router on both and other computers on the network. My desktop is running windows 7 64 bit and my vm is running CentOS 64 bit (which is what I use to test my web server stuff). At my school the VM has a dedicated IP and i don't have this issue, but I am home now and having issues trying to set this up behind my dumb router...I had already tried changing the VINC (i believe) to hide the vmnet1 and vmnet8 connections from the windows firewall and this seemed to have worked for like 5 minutes and then stopped... Any ideas? Thanks

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• SMTP 25 blocked externally

  - by Jeff

  not sure how to title this question... we run an exchange server with around 80 internal users, all outgoing mail is relayed off a smart host (ISP smtp server) so nothing is actually sent to the world via our server. i wanted to check the server, locally i can telnet to port 25 with no issues and receive the esmtp service ready reply. whenever i do it from an external address (off our local network) i receive unable to connect error 10060. can this cause problems with SPF records, and reverse DNS ? should my exchange server be able to accept smtp requests, requiring authentication before i am able to send from external addresses? if so how... also the exchange server is behind a NAT (asa) device, more than likely thinking that the nat is not configured to route the smtp 25 request to the exchange server.. thanks

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• Linux distro for acer 4741G laptop

  - by sandundhammikaperera

  Hi all, I need to install linux for my acer 4741 laptop. Anyone who did this before and managed to solve the device driver problems please share your experience with me. I already installed the backtrack linux and I able to make it work the both wireless and wired network connections and also the sound card is also working. But the problem is that I unable to configure 1360x768 resolution of the display. The display looking really flat and ugly under that linux. some help ? can you guide how to correctly configure the /etc/X11/xorg.conf ? --Thanks in advance--

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• Group policy reset upon restart?

  - by sc_ray

  Is it possible for a group policy to revert back to its original state upon server restart? Our servers are hosted as a Virtual Machine on the rack. We had to restart our server for some reason and all of a sudden we cannot remote desktop into the server any more. Pinging the server succeeds but RDPing into it fails. My assumption is that the group policy has reverted back preventing any remote desktop connections from taking place. Is that a possibility? Since the network is managed by another group, we don't have the authority to physically look into what's going on with this particular VM. Can somebody suggest some ideas? Thanks

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• When NOT to use virtualisation? [closed]

  - by Nils

  When virtualisation was new, we tried to virtualized everything. Then came the cases where the virtual machine was very much slower than a physical one. It boils down to the following ruleset (with us) when not to virtualize: Network-io-intesive applications (i.e. with many interrupts/packets) Disk-io-intensive (if not on SAN storage) RAM-intensive (this is the most precious resource) Now this is true for a combination of XEN using local DRBD storage. The same seems to be true for Hyper-V using DAS. I wonder - is it true for all combinations - and what are your limits on these combinations?

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• Is there a Utility that will scan selected locations and return all files older than a certain date?

  - by CT

  Can anyone recommend a utility that can scan specified directory locations (network shares specifically) and return all files older than a certain date? I am looking to implement a data retention policy at my workplace. As our amount of data grows it puts a large strain on our backup routines. I would like to move old data to some sort of archival system. Extra points for the ability to move queried old files to another location for archival and the ability to create schedules for when this occurs. Many thanks. EDIT: Windows Shop. Mostly Windows 2003 Servers.

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• Can I run Win7 virtualized for my HTPC?

  - by Daniel Schaffer

  I'm currently running Vista for my HTPC, and am planning on upgrading to Win7 soon. However, I've been considering installing it as a VM so that I can run Windows Server 2008 and/or Windows Home Server. The single requirement is that the HTPC must boot up to Windows Media Center with absolutely no user intervention. I need to be able to hit the power button have it go. I've got this working currently, so I don't need to keep a keyboard or mouse plugged in - all I use is my remote. If possible, I'd love to be able to do these other things: Use Win2k8 Server as a VM host for Win7 Pro and WHS. This also lets me run IIS7 for doing ASP.NET development Use WHS for all the wonderful things it does for a home network Are either of the two optional things possible while meeting the WMC requirement?

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• enable tcp_syncookies even after reboot

  - by Tim

  I'm running Scientific Linux 6.1 and would like to set net.ipv4.tcp_syncookies=1. I've set that in /etc/sysctl.conf and, if I do a sysctl -p then sysctl -q net.ipv4.tcp_syncookies it shows it's properly set. Sadly, if I reboot the machine, and sysctl -q again, it goes back to 0. I've tried to grep around and see if something else is resetting it to 0 during the boot process but haven't turned up anything. I've googled and everything points to sysctl.conf. The only thing I can think of is maybe networking isn't up by the time that file gets read but, honestly, I'm a developer and well beyond my natural skills here:) I'm tempted to just set it directly in /etc/init.d/network but then that feels hackish and so, I thought better of it and I'm here in search of the "right" way to do it. Any pointers?

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• Oracle Fusion Middleware 11gR1 ?FAQ??

  - by Hiroyuki Yoshino

  ??????FAQ????????????????? Oracle Technology Network (OTN)???????·??????·???????? Q. "Generic", "x86", "x86-64", ????????????????????????????????? A. ?????????????? Generic ????????·???????????????? 32????64???·??????????JDK/JVM????????? JDK/JVM???????????????????? x86 Supported System Configurations??????????????????????????????32???·???????????? x86-64 Supported System Configurations??????????????????????????????64???·???????????? ?????????? ("SPARC"??) Supported System Configurations????????????????????????????????????WebCenter for AIX?Portal, Forms, Reports and Discoverer for HP-UX PA-RISC???????? Q. SOA 11gR1 (11.1.1.1.0)??????????? 11gR1 (11.1.1.1.0)????????????????? A. ??????·????11gR1???????????????????????????????Oracle Support???????????????? Q. Oracle Fusion Middleware 11gR1???????????????????? A. Oracle Fusion Middleware 11gR1 ????????????????? Supported System Configurations?????????????? Q. Oracle Fusion Middleware 11gR1?????????????????????????????? A. Oracle Fusion Middleware?Oracle?????? Oracle Virtual Machine ????????????Oracle??????????????????????????????????????????????????? ???????? 

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• Safe to use high port numbers? (re: obscuring web services)

  - by sofakng

  I have a small home network and I'm trying to balance the need for security versus convenience. The safest way to secure internal web servers is to only connect using VPNs but this seems overkill to protect a DVRs remote web interface (for example). As a compromise, would it be better to use very large ports numbers? (eg. five digits up to 65531) I've read that port scanners typically only scan the first 10,000 ports so using very high port numbers is a bit more secure. Is this true? Are there better ways to protect web servers? (ie. web guis for applications)

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• Cisco 1760 T1 Setup

  - by Joseph

  My 1760 has a WIC1-T1 card in Slot 0 and the slot 0 "OK" light is lit. When the router boots it shows that it sees the T1 card. I would like to configure my T1. I received the following details from my ISP: * Removed IP's IP Version: IPv4 Router Interface: edge1.mia1 -- t1-2/1/0:2:13 -- Switch Port: Vlan: WAN Network: 4.59.?.?/30 Level3 Side: 4.59.?.? Customer Side: 4.59.?.? Cust. LAN IPs: 4.59.?.?/27 The problem is that it is not listed under interfaces. I am a noob with IOS, please let me know if you need more details. Thanks.

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• Can't set up printer

  - by Jason Swett

  I'm trying to set up an HP OFficejet Pro 8500 A909a on my Windows XP machine over the network. I know the IP address of the printer but it's unclear to me how to set it up based on that. I have no idea how to troubleshoot this problem. I've tried installing the drivers but when I do that it tells me the printer is on a different gateway from my workstation, which is not true. Also, other people in the office are able to connect to this printer just fine, although the driver apparently didn't work for them, either.

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• Need help configuring NAT

  - by QuinnFTW

  First of all, the router I am using is a Cisco WRVS4400N. My company runs a software which handles the MySQL database of all of their products. The software now has an e-commerce module, so I have to set up a secure tunnel from our network to the server that will be hosting our e-commerce site so that when the database is updated, the site will also be updated. The technician completeing the job said there is an IP conflict, and has asked me to NAT 192.168.0.0/24 to 192.168.115.0/24. I am not really sure how to do this, and they want to charge $150 an hour to do it for me. Can anyone help?

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• Folder Permissions in Windows 7

  - by gameshints

  I'm trying to securely share a folder across two computers on a relatively public network. However, I'm a bit confused on how permissions work and was hoping for some clarification between the following so I don't accidentally make something public I don't want. When you right-click a folder and go to properties, what is the difference between Sharing Tab - 'Share...' button - List of users and permissions there Sharing Tab - 'Advanced Sharing...' button - 'Permissions' button - List of users and permissions there Security Tab - List of users and permissions there Thanks!

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• Windows 7 File Transfer Speed over Gigabit is slow

  - by Adam Haile

  I've got windows 7 pro running on my file server and my main desktop. Each has a gigabit network connection and I'm connected to a gigabit switch. However, when trying to copy some large files, it's running pretty slow at a measly 12-15 MB/s The data is coming from a 7200RPM SATA drive (which I think should be good for almost 150MB/s) and going to a Drobo on the server connected via FireWire 800, so I can't think of any bottlenecks I might have in the hardware. But TeraCopy still says it's only going at 12-15 MB/s What else could be wrong here?

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• LAN full of public ipv4 addresses - How to filter it?

  - by sparc86

  The answer to my question maybe is not that hard but anyways, I do not know what to do. So, I just got in a new job in a Univerisity and I found out that the network (the LAN) is full of public IP addresses. Seriously, the whole LAN (probably more than 150 hosts) has it' own internet IP address and I don't know how to manage it. I have a very good experience using iptables (Linux firewall) in a NAT'ed environment. But then how should I proceed in an environment where all my LAN is working with a bunch of public IP addresses? Should I just use the "forward" rules and ignore the NAT rules or is there any other issue in such environment which I should take care? Can I add a firewall between the router and the LAN in order to produce packet filtering for these public IP addresses in my LAN or will this just not work? Thanks!

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• How long does it take in practice to warm up large in-memory databases?

  - by Sim

  Companies such as Peak Hosting are offering 64 core machines with 512Gb RAM for $2K/month. This is a very interesting choice for in-memory databases such as Memcached/Redis as well as databases whose performance degrades rapidly when the data & indexes don't fit in RAM, such as MongoDB. My main concern with monster machines such as these is the time it takes to warm up an in-memory database. In my experience, theoretical metrics, e.g., that SATA can load 100Mb/sec, fall short of what happens in practice. Even at that rate, 100Mb/sec means that loading up 512Gb RAM machine from SATA disks can take over 1 1/2 hours (!). I am looking for real-world reports of warm-up times for machines with very large memory. Please, share details of the software on the machine, data size, storage configuration, e.g., SATA or SSD, network, hosting/cloud provider, if relevant, etc.

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