update supported OS

diff --git a/trex_book.asciidoc b/trex_book.asciidoc
index 0ff4154..806e269 100755 (executable)
--- a/trex_book.asciidoc
+++ b/trex_book.asciidoc
@@ -185,17 +185,12 @@ VMXNET3 (see notes) | VMware paravirtualized  | Connect using VMware vSwitch
 
 [IMPORTANT]
 =====================================
-* For VMXNET3, use Ubuntu. Fedora 18 is not supported and causes crash. 
 * Intel SFP+ 10Gb/sec is the only one supported by default on the standard Linux driver. TRex also supports Cisco 10Gb/sec SFP+. 
 // above, replace "only one" with "only mode"?
 * For operating high speed throughput (example: several Intel XL710 40Gb/sec), use different link:https://en.wikipedia.org/wiki/Non-uniform_memory_access[NUMA] nodes for different NICs. +
     To verify NUMA and NIC topology: `lstopo (yum install hwloc)` +
     To display CPU info, including NUMA node: `lscpu` +
     NUMA usage xref:numa-example[example]
-* Using Intel XL710 with Fedora 18 requires updating kernel:
-** `> sudo yum update kernel`
-** `> sudo yum update kernel-devel`
-** `> sudo yum update kernel-headers`
 * For Intel XL710 NICs, verify that the NVM is v5.04 . xref:xl710-firmware[Info].
 **  `> sudo ./t-rex-64 -f cap2/dns.yaml -d 0 *-v 6* --nc | grep NVM` +
     `PMD:  FW 5.0 API 1.5 NVM 05.00.04  eetrack 800013fc` 
@@ -232,11 +227,11 @@ NOTE: Purchase the 10Gb/sec SFP+ separately. Cisco would be fine with TRex (but
 ==== Supported versions
 
 Supported Linux versions:
-* Fedora 18-20, 64-bit kernel (not 32-bit)
+* Fedora 20-23, 64-bit kernel (not 32-bit)
 * Ubuntu 14.04.1 LTS, 64-bit kernel (not 32-bit)
+* Ubuntu 16.xx LTS, 64-bit kernel (not 32-bit) 
 
 NOTE: Additional OS version may be supported by compiling the necessary drivers.
-// we should indicate exactly which drivers this means
 
 To check whether a kernel is 64-bit, verify that the ouput of the following command is `x86_64`.
 
@@ -255,10 +250,6 @@ ISO images for supported Linux releases can be downloaded from:
 [options="header",cols="1^,2^",width="50%"]
 |======================================
 | Distribution | SHA256 Checksum
-| link:http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/18/Fedora/x86_64/iso/Fedora-18-x86_64-DVD.iso[Fedora 18] 
-    | link:http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/18/Fedora/x86_64/iso/Fedora-18-x86_64-CHECKSUM[Fedora 18 CHECKSUM] 
-| link:http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/19/Fedora/x86_64/iso/Fedora-19-x86_64-DVD.iso[Fedora 19]
-    | link:http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/19/Fedora/x86_64/iso/Fedora-19-x86_64-CHECKSUM[Fedora 19 CHECKSUM] 
 | link:http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/20/Fedora/x86_64/iso/Fedora-20-x86_64-DVD.iso[Fedora 20]
     | link:http://archives.fedoraproject.org/pub/archive/fedora/linux/releases/20/Fedora/x86_64/iso/Fedora-20-x86_64-CHECKSUM[Fedora 20 CHECKSUM] 
 | link:http://fedora-mirror01.rbc.ru/pub/fedora/linux/releases/21/Server/x86_64/iso/Fedora-Server-DVD-x86_64-21.iso[Fedora 21]