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I do not issue any guarantee that this will work for you! Continue reading Setting Up Postfix As Buckup MX Creating Mikrotik OpenVPN Server Certificates OpenVPN works with SSL certificates. You can either use http://cacert.org to issue these or use the easy-rsa scripts, that come with most OpenVPN distributions. On RouterOS, all you have to do is to upload them via ftp (ca certificate and router certificate and private key) and import them with . . . → Read More: Setup Mikrotik OpenVPN Server using CAcert with Linux Client This tutorial will explain Export the DHCP database from a server that is running Microsoft Windows Server 2003 or Windows Server 2008 To move a DHCP database and configuration from a server that is running Windows Server 2003 or Windows Server 2008 to another server that is running Windows Server 2008.Read more: http://www.technohub.in/how-to-migrate-dhcp-server-from-a-windows-server-2003-to-windows-server-2008.html#ixzz0tBxuZGCC Under . . . → Read More: Step By Step Tutorial How to migrate DHCP server from a Windows server 2003 to Windows server 2008 Following are some very useful Ipv6 related resources. Continue reading IPv6 resources, documents, tutorials and guides
NBPSCS(iSS) = Number of coded bits per single carrier NSD = Number of data sub-carriers NSP = Number of pilot sub-carriers (used for pilot tracking) NCBPS = Number of coded bits per OFDM symbol NDBPS = Number of data bits per OFDM symbol MCS 0 – 7 are for 1×1 MIMO (1 spacial stream), MCS 8 – 15 are 2×2 MIMO (2 spacial streams). MCS 16 – 23 are 3×3 MIMO (3 spacial streams) and MCS 24 – 31 are for 4×4 MIMO (4 spacial streams). Ο vendor are obliged to support MCS 0 – 15 depending on weather they implement 1×1 or 2×2 MIMO at 20MHz. Support for 40MHz and the rest of MCS is optional. MCS 32 is special for high noise environments and it basically does duplication of data, its BPSK with 1 spacial stream in 40MHz only and with max rate 6.7Mb/s . MCS 33 – 76 are in unequal modulation of 2 spacial streams upwards, in other words every stream has different modulation (QPSK/QAM), the 33 – 38 has 2 streams (max 108.3Mb/s @ 20MHz, 225Mb/s @ 40MHz), 39 – 52 has 3 streams (max 173,3Mb/s @20MHz, 360Mb/s @ 40MHz) and 53 – 76 has 4 streams (max 238Mb/s @ 20MHz, 495Μb/s @ 40MHz). The purpose is to have flexibility and better adaptivity to environment conditions (all this provided there is in place an advanced rate control algorithm that takes into account many different parameters). MCS 77 – 127 are reserved. Continue reading 802.11n Modulation and Coding Schemes (MCS) |
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In this tutorial I will show how you can set up a Postfix mailserver as a backup mail exchanger for a domain so that it accepts mails for this domain in case the primary mail exchanger is down or unreachable, and passes the mails on to the primary MX once that one is up again.
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