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Feb
15
81

Keep your session live !

By Arda Gözübüyükoğlu | Filed in Information Technologies, Linux, Network, Security

TCP Keepalive

Behind some firewalls/proxies or NAT devices your session can be closed without your wish. If you are looking for a way to avoid from this you can use TCP keepalives.
What is Keepalive ?
TCP keepalive Under Transmission Control Protocol (TCP) keepalives are an optional feature, and if included must default to off.[1] The keepalive packet contains null data. In an Ethernet network, a keepalive frame length is 60 bytes, while acknowledge to this, also a null data frame, is 54 bytes. There are three parameters related to keepalive:

Keepalive time is the duration between two keepalive transmissions in idle condition. TCP keepalive period is required to be configurable and by default is set to no less than 2 hours. Keepalive interval is the duration between two successive keepalive retransmissions, if acknowledgement to the previous keepalive transmission is not received. Keepalive retry is the number of retransmissions to be carried out before declaring that remote end is not available.

  • http://en.wikipedia.org/wiki/Keepalive

What can be done for OpenSSH ?

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Feb
15
12

How to send mail via PERL!

By Arda Gözübüyükoğlu | Filed in Information Technologies, Linux, Mail Servers, Network, Uncategorized

Sending mail via PERL or making an API for your NMS programs.

First Step (install Net::SMTP)

You can use cpan for installing Net::SMTP

…below you can find an example how to install Net::SMTP via cpan…

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Jan
16
7

GOZUBUYUKOGLU NETWORK now has Physical Security :)

By Arda Gözübüyükoğlu | Filed in Uncategorized

Gözübüyükoğlu Network is now under physical protection via Pronet.

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Nov
25
9

Lords & Knights

By Arda Gözübüyükoğlu | Filed in Uncategorized

I have started to play an online  game called  Lords & Knights , after playing nothing for 5 years.

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Oct
4
35

Make your own surveillance system with a simple webcam & linux

By Arda Gözübüyükoğlu | Filed in Uncategorized

First of all you need at least one webcam and a PC with USB input/s, I have 2 Logitech Pro 5000 and a PC(Celeron 1200).I am using customized debian by the way but , you can use anything and package managers to obtain required software.

Logitech Pro 5000 (http://www.logitech.com/en-us/435/243?WT.z_sp=Image)  You have to find related driver for your cam ;)

I used uvcvideo (http://www.ideasonboard.org/uvc/) kernel org is still in maintenance so I suggest you to use packages.

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Sep
22
8

How to enable active FTP behind NAT for a Linux GW/FW or Router?

By Arda Gözübüyükoğlu | Filed in Information Technologies, Linux, Network, Security

 

You have a FTP server behind NAT and you want to use active FTP . What will you do?

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Sep
22
114

How can you get IPv6 enabled logo ?

By Arda Gözübüyükoğlu | Filed in IPv6, Network

 

The IPv6 Forum IPv6 Enabled Logo program objective is to accelerate deployment of IPv6. The goal of this program is to increase user confidence by demonstrating that IPv6 is available now and is ready to be used.

You can click the links below and register your site , if it is IPv6 enabled you can use the your self created logo

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Sep
22
45

Debian (Squeeze) tcpdump vlan tag problem

By Arda Gözübüyükoğlu | Filed in Kernel, Linux

While I was capturing a vlan tagged interface on one of my servers , found that there is`t any vlan tag on packets . After a quick search I realized that it is related to  libpcap .

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Sep
18
72

Link based redundancy in Linux

By Arda Gözübüyükoğlu | Filed in Kernel, Linux, Network, Redundancy

Linux Bonding

There is some wonderful methods to make your server/s redundant. One of them is “Bonding” .http://en.wikipedia.org/wiki/Channel_bonding

You can also try LACP(802.3ad) while configuring it.  http://en.wikipedia.org/wiki/802.3ad

Linux Bonding

The Linux bonding driver provides a method for aggregating
   multiple network interfaces into a single logical "bonded" interface.
   The behavior of the bonded interfaces depends upon the mode; generally
   speaking, modes provide either hot standby or load balancing services.
   Additionally, link integrity monitoring may be performed.
http://www.sourceforge.net/projects/bonding/

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Sep
14
37

IPv6 Status in Turkey & My Home ;)

By Arda Gözübüyükoğlu | Filed in IPv6, Network

Links related to IPv6 Status in Turkey

 

What about GOZUBUYUKOGLU Network!

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