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How IPv6 headers handle next headers?
Barriers to IPv6 deployment: addressingHow to prepare (or not) small company to IPv6How does 6rd (IPv6 Rapid Deployment) route over the public internet?Telnet over ipv4 proxy to ipv6 hostGetting Squid and TPROXY with IPv6 working on CentOS 7Build IPv6 over IPv4 tunnel between server and home networkHow to use an IPv6 Edge router in an IPv4 network?Ensure systemd wait for IPv6 before start service unitIPv6 and ESP as a next headerMoving a small network to IPv6
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I was reading that IPv6 headers have a fixed size, but then there is a field for next header also present in the header, which can specify the next header.
Even if the main header is being transmitted first and then the later ones than how is this better compared to the variable size in IPv4. Also how is the main header keeping a track of the next headers
networking ipv6
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
add a comment |
I was reading that IPv6 headers have a fixed size, but then there is a field for next header also present in the header, which can specify the next header.
Even if the main header is being transmitted first and then the later ones than how is this better compared to the variable size in IPv4. Also how is the main header keeping a track of the next headers
networking ipv6
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
add a comment |
I was reading that IPv6 headers have a fixed size, but then there is a field for next header also present in the header, which can specify the next header.
Even if the main header is being transmitted first and then the later ones than how is this better compared to the variable size in IPv4. Also how is the main header keeping a track of the next headers
networking ipv6
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
I was reading that IPv6 headers have a fixed size, but then there is a field for next header also present in the header, which can specify the next header.
Even if the main header is being transmitted first and then the later ones than how is this better compared to the variable size in IPv4. Also how is the main header keeping a track of the next headers
networking ipv6
networking ipv6
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
edited May 6 at 8:06
Gaurav Pant
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
asked May 6 at 7:59
Gaurav PantGaurav Pant
85
85
add a comment |
add a comment |
1 Answer
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Fixed header size is for simplicity and speed. Having the basics of source, dest, and hop limit in fixed locations allows for fast forwarding; acceleration of bit operations, possibly in hardware ASICs, is easier with constant offsets.
Next header allows for encapsulation of either the upper protocol payload (TCP) or an IPv6 header extension via the same mechanism. See examples in RFC8200. Essentially, this is a "linked list" of headers, each pointing to the next, and all fitting in the payload size.
This scheme allows fancy header features to be optional. A packet capture on my desktop shows several examples of no extension headers, the next header is direct to TCP.
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
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1 Answer
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1 Answer
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Fixed header size is for simplicity and speed. Having the basics of source, dest, and hop limit in fixed locations allows for fast forwarding; acceleration of bit operations, possibly in hardware ASICs, is easier with constant offsets.
Next header allows for encapsulation of either the upper protocol payload (TCP) or an IPv6 header extension via the same mechanism. See examples in RFC8200. Essentially, this is a "linked list" of headers, each pointing to the next, and all fitting in the payload size.
This scheme allows fancy header features to be optional. A packet capture on my desktop shows several examples of no extension headers, the next header is direct to TCP.
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
add a comment |
Fixed header size is for simplicity and speed. Having the basics of source, dest, and hop limit in fixed locations allows for fast forwarding; acceleration of bit operations, possibly in hardware ASICs, is easier with constant offsets.
Next header allows for encapsulation of either the upper protocol payload (TCP) or an IPv6 header extension via the same mechanism. See examples in RFC8200. Essentially, this is a "linked list" of headers, each pointing to the next, and all fitting in the payload size.
This scheme allows fancy header features to be optional. A packet capture on my desktop shows several examples of no extension headers, the next header is direct to TCP.
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
add a comment |
Fixed header size is for simplicity and speed. Having the basics of source, dest, and hop limit in fixed locations allows for fast forwarding; acceleration of bit operations, possibly in hardware ASICs, is easier with constant offsets.
Next header allows for encapsulation of either the upper protocol payload (TCP) or an IPv6 header extension via the same mechanism. See examples in RFC8200. Essentially, this is a "linked list" of headers, each pointing to the next, and all fitting in the payload size.
This scheme allows fancy header features to be optional. A packet capture on my desktop shows several examples of no extension headers, the next header is direct to TCP.
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
Fixed header size is for simplicity and speed. Having the basics of source, dest, and hop limit in fixed locations allows for fast forwarding; acceleration of bit operations, possibly in hardware ASICs, is easier with constant offsets.
Next header allows for encapsulation of either the upper protocol payload (TCP) or an IPv6 header extension via the same mechanism. See examples in RFC8200. Essentially, this is a "linked list" of headers, each pointing to the next, and all fitting in the payload size.
This scheme allows fancy header features to be optional. A packet capture on my desktop shows several examples of no extension headers, the next header is direct to TCP.
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
answered May 6 at 12:29
John MahowaldJohn Mahowald
10.1k1714
10.1k1714
add a comment |
add a comment |
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