تفاوت های IPv4 و IPv6

با اینکه علاقه ای به استفاده از سرویس دهنده های مبتنی بر ویندوز در خدمات  Secure2S ندارم، اما مجبور شدم در مورد  Windows Server 2008 کمی کسب اطلاع کنم.۳ کتاب دست اول رو به عنوان شروع از مایکروسافت پرس انتخاب کردم، با  Windows Server 2008 Networking and Network Access Protection شروع کردم فعلا!
خوب شروع شده است و این هم برگزیده فصل اول: تفاوت هایی که در مورد  
IPv4 و IPv6 باید به خاطر بسپارید:

IPv4   IPv6
IP addresses are 32 bits.   IP addresses are 128 bits.
QoS headers are optional.   QoS support is built in.
IPsec support is optional.   IPsec support is required for all hosts.
Header includes a checksum.   Header does not include a checksum.
Header includes options that always consume space in the header.
Optional fields are stored in header extensions (although IPv6
header size is still twice the IPv4 header  size).
Hosts use Address Resolution Protocol (ARP) to identify each other
on local networks.  
Hosts use
Neighbor Solicitation messages to identify each other on
local networks, which is easier to manage.
Hosts use Internet Group Management Protocol (IGMP) to manage local
subnet group memberships for multicasting.  
Hosts use Multicast Listener Discovery (MLD) to manage
multicast group memberships.
Most hosts receive IP addresses from a DHCP server (although some
hosts can use Internet Control Message Protocol, or ICMP, router
discovery, it’s uncommon).  
Most hosts use ICMP Router Solicitation and Router
Advertisements to determine their IP address, with an optional
DHCPv6
server query for additional configuration settings.
Hosts use broadcast messages to communicate with all hosts on the
local network.  
Hosts use link-local scope all-nodes multicast instead of
broadcast messages.
IPv4 uses interface ID (A) resource records in DNS queries.
IPv6 uses
IPv6 interface ID (AAAA)
resource records in DNS
queries.
IPv4 has a maximum packet size of 65,535 bytes.
An IPv6 Jumbogram can be 4,294,967,295 bytes.

اطلاع رسانی شفاف

بیشتر از ۲ سال هست که برای اشتراک خانگی از
سرویس های سپنتا
استفاده می کنم، با اینکه مانند اکثر سرویس دهنده های ایرانی میزان خرابی (با بهانه
هایی بی اندازه) کم نیست، اما اطلاع رسانی و خدمات مشتریان این سرویس دهنده از
مهمترین علت هایی است که من آن را پیشنهاد می کنم. گراف مصرف پهنای باند (MRTG)
جزو بهترین گزارش های سپنتا برای کاربران ADSL است. این
گراف برای اشتراک ۲۵۶ من است که فقط تا ۲۱۲ امکان استفاده را داده است:


Tunneling with Free BSD



Tunneling with Free BSD


When talking about tunneling, different definitions come to people’s minds. Basically, tunneling is transmitting data that is encapsulated into a pipe, over a public network (for example, the Internet). However, there are different methods to tunnel data over a public network for different approaches. For example, when security is a concern, tunnel protocols with cryptography are more favorable. But when performance has higher priority, protocols with lower packet overheads will be chosen. FreeBSD 7 has a built-in support for a number of important tunneling protocols, although there are also many third-party applications in FreeBSD packages that support more tunneling protocols.

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Network Administration with FreeBSD 7