IPv4 vs IPv6: Why the Internet is Changing
Direct Answer
The internet is transitioning from IPv4 to IPv6 because we have run out of unique IPv4 addresses. While IPv4 supports only 4.3 billion addresses—nowhere near enough for the world’s devices—IPv6 provides a virtually infinite supply (340 undecillion). For users in Bangladesh, this transition is the long-term solution to problems like CGNAT, high gaming latency, and the need to pay extra for “Real IPs.”
Comparison at a Glance
| Feature | IPv4 | IPv6 |
|---|---|---|
| Address Size | 32-bit | 128-bit |
| Address Format | Dotted Decimal (e.g., 103.145.1.1) | Hexadecimal (e.g., 2001:db8::1) |
| Total Addresses | ~4.3 Billion | ~340 Undecillion |
| Configuration | Manual or DHCP | Auto-configuration (SLAAC) or DHCPv6 |
| Security | Optional (IPSec) | Built-in (IPSec support mandated) |
| NAT Support | Required (due to shortage) | Not Required (every device gets a public IP) |
Why the Transition is Happening
1. IPv4 Exhaustion
When IPv4 was created in the 1980s, 4.3 billion addresses seemed like plenty. However, with the explosion of smartphones, IoT devices, and global internet access, the world officially ran out of unallocated IPv4 “blocks” years ago.
2. The Efficiency of IPv6
IPv6 isn’t just about more addresses; it’s about better performance:
- No more NAT: In an IPv6 world, every single device in your home can have its own public IP address. This eliminates the need for Network Address Translation (NAT), which often causes issues for gamers and hosted services.
- Simplified Headers: IPv6 routers can process packets faster because the “envelope” (header) containing the data is simpler and more efficient.
- Auto-Configuration: Devices can generate their own IPv6 addresses automatically as soon as they connect to a network.
How it Affects Users in Bangladesh
In Bangladesh, the transition is currently in a “Dual Stack” phase, where ISPs try to support both protocols simultaneously.
The CGNAT Problem
Because IPv4 addresses are scarce and expensive, most ISPs in Bangladesh use CGNAT (Carrier-Grade NAT). This means hundreds of customers share a single “Real IP.” This leads to:
- Strict NAT in games (Call of Duty, FIFA, etc.).
- Difficulties in accessing home CCTV or servers remotely.
- “Identity” issues where a website bans one user, and everyone sharing that IP gets blocked.
IPv6 solves this entirely. If your ISP provides IPv6, your router and devices get unique global addresses, bypassing the limitations of CGNAT.
Current Adoption Status
While major International Internet Gateways (IIGs) and Nationwide Telecommunication Transmission Networks (NTTNs) in Bangladesh are IPv6-ready, many local ISPs are still lagging behind.
- Check your status: You can visit test-ipv6.com to see if your current connection supports IPv6.
- Hardware: Most modern routers (TP-Link, Netgear, Tenda) sold in BD support IPv6, but it often needs to be manually enabled in the settings.
Technical Differences
Address Format
- IPv4 uses four octets (8 bits each) separated by dots.
- Example:
192.168.1.1
- Example:
- IPv6 uses eight groups of four hexadecimal digits separated by colons.
- Example:
2400:3200:cd11:0000:0000:0000:0000:0001(can be shortened to2400:3200:cd11::1).
- Example:
Packet Handling
In IPv4, if a packet is too large for a specific part of the network, routers “fragment” (break) it. In IPv6, routers no longer fragment packets; the sending device must determine the correct size beforehand, reducing the workload on the internet’s backbone routers.
FAQ
Does IPv6 make my internet faster?
Not necessarily. Your raw speed (Mbps) depends on your ISP package. However, IPv6 can reduce “latency” (ping) because it removes the need for NAT processing at the ISP level.
Do I need to buy a new router for IPv6?
If your router was made in the last 5-7 years, it likely supports IPv6. You may just need to log in to the admin panel and enable “IPv6” (usually found under Advanced Settings).
Can IPv4 and IPv6 talk to each other?
Directly, no. They are different languages. However, technologies like Dual Stack (running both) or 6to4 Tunneling allow the two systems to coexist during this long transition period.