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• Centos server email delay [closed]

  - by sisko

  I am hosting a website on a CentOS server and all was well until I tried sending emails from my website. I realized it is taking unusually long to send email and the webpage to refresh. I actually timed it at just over 6 minutes to send one email to 3 addresses. I have been able to determine the server is utilizing sendmail but I don't know much else about dealing with server issues on a Centos server. Can anyone please help me out?

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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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• 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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• How do I run both Tomcat and PHP on Linux on port 80?

  - by Michael Gaylord

  I would like to host both Tomcat and PHP on port 80 on Linux and I have 2 IP addresses available. I am only using PHP so that I can host some mailing list software, I can map it to newsletter.mydomain.com. So my question is, is it possible to run Tomcat on port 80 on 1 IP address and Apache on port 80 on another IP address?

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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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• 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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• 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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• 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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• 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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• 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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• 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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• Enterprise IPv6 Migration - End of proxypac ? Start of Point-to-Point ? +10K users

  - by Yohann

  Let's start with a diagram : We can see a "typical" IPv4 company network with : An Internet acces through a proxy An "Others companys" access through an dedicated proxy A direct access to local resources All computers have a proxy.pac file that indicates which proxy to use or whether to connect directly. Computers have access to just a local DNS (no name resolution for google.com for example.) By the way ... The company does not respect the RFC1918 internally and uses public addresses! (historical reason). The use of internet proxy explicitly makes it possible to not to have problem. What if we would migrate to IPv6? Step 1 : IPv6 internet access Internet access in IPv6 is easy. Indeed, just connect the proxy in Internet IPv4 and IPv6. There is nothing to do in internal network : Step 2 : IPv6 AND IPv4 in internal network And why not full IPv6 network directly? Because there is always the old servers that are not compatible IPv6 .. Option 1 : Same architecture as in IPv4 with a proxy pac This is probably the easiest solution. But is this the best? I think the transition to IPv6 is an opportunity not to bother with this proxy pac! Option 2 : New architecture with transparent proxy, whithout proxypac, recursive DNS Oh yes! In this new architecture, we have: Explicit Internet Proxy becomes a Transparent Internet Proxy Local DNS becomes a Normal Recursive DNS + authorative for local domains No proxypac Explicit Company Proxy becomes a Transparent Company Proxy Routing Internal Routers reditect IP of appx.ext.example.com to Company Proxy. The default gateway is the Transparent Internet proxy. Questions What do you think of this architecture IPv6? This architecture will reveal the IP addresses of our internal network but it is protected by firewalls. Is this a real big problem? Should we keep the explicit use of a proxy? -How would you make for this migration scenario? -And you, how do you do in your company? Thanks! Feel free to edit my post to make it better.

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• Redirect all outgoing traffic on port 80 to a different IP on the same server

  - by Spacedust

  I have multiple IP addresses on the same server and I would like to redirect all outgoing traffic on port 80 to a different IP on the same server just no to use always main IP. Currently I'm using this: /sbin/iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source IP; and it works well, but it redirects everything and when I make backups over SSH backup it's failing. System: CentOS 5.8 64-bit

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• Write, wall, who and mesg

  - by miniBill

  I want to set up a server with a lot of users so that (in order of importance): Users cannot obtain ip addresses of other users with who, or last Users cannot wall Users can write to each other Users are able to selectively mesg n other users, as opposed to simply blocking everyone Point 1 is easily solved by a 660 on wtmp and utmp, but I don't know how to achieve the other points The server runs Gentoo Linux

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• How to combine AWS and dedicated external servers?

  - by rfw21

  I have an extensive network of servers all currently hosted on AWS EC2. For reasons of cost I plan to gradually migrate to dedicated servers where possible. So: How can I best combine AWS and non-AWS servers in my network? Ideally, I should be able to assign internal IP addresses to the external servers, include them in AWS security groups and ensure that all private traffic between my AWS servers and external servers is secure.

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• Recommendations of mail merge freeware?

  - by Chris

  At work (Exchange server) our team often needs to send emails to 500+ partners. It's currently a very dull job, so I've tried the merge features in Office 2007. However, it can't: Include a merge field in the subject ("Regarding your account: ") Send to semi-colon separated addresses (one line might be "[email protected];[email protected];[email protected]") Send from a particular mailbox account, and store all the sent mails in Outlook. Can anyone recommend any free/affordable software which will work with Exchange and can be used commercially?

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• slave dns server, resolv.conf configuration

  - by Tim the Enchanter

  I have two servers (a master and slave) running DNS (bind). What should the /etc/resolv.conf file look like for the master and the slave? For example should the servers running the DNS have only : nameserver 127.0.0.1 or should they refer to the I.P. addresses of each server, as the other servers on the network do : search <mydomain>.co.uk nameserver 192.168.1.52 nameserver 192.168.1.57

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• Can I connect two routers to one switch?

  - by vanneto

  I want to connect two routers to a switch which will then be connected to a modem. Now as far as I know a switch does not do network translation and this won't work with one IP address. So I bought two addresses at my ISP. Attached is a simple schematic that explains what I want to do. Is there any additional configuration needed on either of the routers (Linksys WRT54GL) to make this work or will it "Just Work"?

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• Switches with large MAC address table?

  - by user1290200

  Does anyone know which switches have a large MAC address table ? I see most switches having only 8K, but we need to store way, way more than that (hundreds of K). I know this may seem odd, but trust me, there's no other way we can make our setup work. The only thing we seem to be able to do is install Juniper routers that store up to 1M addresses, but that will get quite costly and we'd rather avoid doing that.

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• How to configure almost 3 dozen laptops quickly [closed]

  - by Mike

  I need to configure almost 3 dozen laptops. We need half of them to have different IP addresses. Would configuring one laptop and then ghosting the rest be the fastest way to do this or is there a better way?

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• Can Windows 7 Built-in VPN Replace Cisco VPN?

  - by Brandon Wang

  Is there any way that the built-in VPN interface in Windows 7 can replace the rediculous Cisco VPN software? I have tried several times using different methods and have failed. It seems if you just plug in the IP addresses and information it doesn't work.

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• How to access this server?

  - by George Edison

  I have a server that I cannot access. At first I thought it was just some temporary failure with the server, but checking from other IP addresses reveals that it is working just fine. It's only my IP address that's failing. So here is what I've tried: nslookup - resolves correctly ping - 100% packet loss using the IP address or domain traceroute - first few hops work, but from about 6 and on, I just get stars Edit: I am using OpenDNS for DNS resolution, and as mentioned above, the problem is not DNS resolution anyway.

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