Browsing articles tagged with "networking - 3/252 - Admins Goodies"
Jan 4, 2013
tom

Connecting to Gest ip address usign host alias [closed]

I have RedHat OS running on VMWare Player. My host operating system is windows7. Network configuration i am using on my virtual machine is NAT. I have configured my Guest operating systems /etc/hosts to have following configuration. [ora112@jipsl01t ~]$ cat /etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost 192.168.179.129 jipsl01t jipsl01t.com when i ping from my host operating system, i can ping to […]

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Jan 3, 2013
tom

Find Printers with Nmap

Whats the best way to find printers in my network with nmap? Is it possible to save the printers ip to a file? Asked by NiklasS If you’re leery of doing OS Fingerprinting for some reason, you can do a more targeted port-scan: nmap -p 9100,515,631 192.168.1.1/24 -oX printers.xml That’ll scan for ports common to printers and printing systems. 9100 = the RAW port for most printers, also known as the direct-IP port 515 = […]

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Dec 28, 2012
tom

Is A Network Copy Timeout Likely To Show Up In Event Viewer Logs?

I am trying to copy a 1.2Gb file between a Windows 7 workstation and a Windows Server 2003 system. That same server also hosts our enterprise’s shares, most of them anyway. The copy from the workstation to the server times out. If not in the event logs, where might this timeout event be recorded? Furthermore, what tools exist, other than doing something like running Wireshark, that would let me see the details of the failure? […]

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Dec 24, 2012
tom

Two IP addresses on two physical interfaces both with gateway

I have a server that I needs to change its IP address. For DNS propagation I need to have both new and old IP addresses on the server for a little while (72 hours). But when ever I ifup eth1 (NIC with new IP) the old IP will lose connection to the world (I cannot even ping it). Both IPs have their own Gateway. I just did it on windows 2008 without any problem and […]

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Dec 23, 2012
tom

is it possible to provide variable arguments to xinetd service?

I have created a bash script to listen on specific port (using xinetd), so whenever there is someone connecting to port, then it invokes the script and provides its output to user. But i need to provide dynamic arguments to server, for example when i telnet to server like telnet myserver 4535 then i should be able to pass an argument like my name “Frank” and it should say “Hello Frank” There is a parameter […]

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Dec 21, 2012
tom

Server sending out packets bigger then MTU

I have a server that I am transferring data off of. We were having some problems that were traced back to the fact that the server is sending out jumbo size frames despite the fact that ifconfig is reporting that the MTU is 1500. How is this possible? The box is running CentOs 5, this is occuring over ipv4. How can I tell the server to stop sending out packets with sizes greater then 1500? […]

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Dec 19, 2012
tom

What is a multi-homed situation? [closed]

I am revising for my networks exam in Jan and I am currently looking at autonomous systems. Can anyone provide me with a for dummies explanation of what a multi-homed situation is? Asked by Stuart Blackler Edit: In the case of autonomous systems, multi-homed means that a system is connected to more than one other autonomous system, usually for resilience. This Wikipedia article covers it. A multihomed Autonomous System is an AS that maintains connections […]

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Dec 19, 2012
tom

No outbound internet connection after restarting CentOS 6.3

After restarting a headless CentOS 6.3 machine, it lost outbound internet connectivity, i.e. I can still connect to the server via SSH (ssh root@**.126.18.56), but stuff such as ping google.com gives google.com: unknown host, and yum list some_package gives a lot of network errors. This is what ifconfig gives: eth0 Link encap:Ethernet HWaddr 00:25:90:78:2D:5D inet addr:**.126.18.56 Bcast:**.126.18.255 Mask:255.255.255.0 inet6 addr: fe80::225:90ff:fe78:2d5d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:75594 errors:0 dropped:0 overruns:0 frame:0 TX […]

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Dec 17, 2012
tom

Port forwarding on Ubuntu – what are the minimum and maximum port numbers to use?

I’m using rinetd on Ubuntu as a port forwarding server. I’m running this on EC2. I need to know which ports are available for me to use for port forwarding. I know that the privileged ports are 0 – 1023, so that means I can start at 1024, correct? Does that also mean that I can use up to 65535? Please remember, this question is specific to Ubuntu. Asked by David Winter This question is […]

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Dec 15, 2012
tom

Debian webserver unreachable for about 10 minutes repeatedly, yet it still pings.

I have one server running Debian 6.0.5 with the problem I can not fix for a few days. Everything is ok if I have running ssh console or “ping -t “. When it has been stopped everything is ok in around 10 minutes. After that we’re loosing our access by web. But if I will reload the page from 4 to 7 times everything coming back. While it’s happends this server can ping anything and […]

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