What is the mac-address of multicast (ipv6)
In IPv4, ff-ff-ff-ff-ff-ff is broadcast address so that this frame can pass layer 2 of all machines.
In IPv6, ARP is not used but ICMPv6 is used to know mac-address by multicasting.
In this case, what is mac-address of multicasting??
If mac-address is not matched, this frame cannot pass layer 2 of destination machine.
So, I really wonder how multicast packet is passed layer 2 by not using ff-ff-ff-ff-ff-ff.
networking
edited Sep 10 '14 at 12:12
jAce
1,14541427
asked Sep 10 '14 at 10:03
curiouscurious
1612
add a comment |
In IPv4, ff-ff-ff-ff-ff-ff is broadcast address so that this frame can pass layer 2 of all machines.
In IPv6, ARP is not used but ICMPv6 is used to know mac-address by multicasting.
In this case, what is mac-address of multicasting??
If mac-address is not matched, this frame cannot pass layer 2 of destination machine.
So, I really wonder how multicast packet is passed layer 2 by not using ff-ff-ff-ff-ff-ff.
networking
edited Sep 10 '14 at 12:12
jAce
1,14541427
asked Sep 10 '14 at 10:03
curiouscurious
1612
add a comment |
In IPv4, ff-ff-ff-ff-ff-ff is broadcast address so that this frame can pass layer 2 of all machines.
In IPv6, ARP is not used but ICMPv6 is used to know mac-address by multicasting.
In this case, what is mac-address of multicasting??
If mac-address is not matched, this frame cannot pass layer 2 of destination machine.
So, I really wonder how multicast packet is passed layer 2 by not using ff-ff-ff-ff-ff-ff.
networking
edited Sep 10 '14 at 12:12
jAce
1,14541427
asked Sep 10 '14 at 10:03
curiouscurious
1612
In IPv4, ff-ff-ff-ff-ff-ff is broadcast address so that this frame can pass layer 2 of all machines.
In IPv6, ARP is not used but ICMPv6 is used to know mac-address by multicasting.
In this case, what is mac-address of multicasting??
If mac-address is not matched, this frame cannot pass layer 2 of destination machine.
So, I really wonder how multicast packet is passed layer 2 by not using ff-ff-ff-ff-ff-ff.
networking
networking
edited Sep 10 '14 at 12:12
jAce
1,14541427
asked Sep 10 '14 at 10:03
curiouscurious
1612
edited Sep 10 '14 at 12:12
jAce
1,14541427
asked Sep 10 '14 at 10:03
curiouscurious
1612
edited Sep 10 '14 at 12:12
jAce
1,14541427
edited Sep 10 '14 at 12:12
jAce
1,14541427
edited Sep 10 '14 at 12:12
jAce
1,14541427
1,14541427
asked Sep 10 '14 at 10:03
curiouscurious
1612
asked Sep 10 '14 at 10:03
curiouscurious
1612
asked Sep 10 '14 at 10:03
curiouscurious
1612
1612
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Ethernet has "multicast" MAC addresses as well – any MAC address with the "group" bit set is technically a multicast address; IPv6 uses the prefix 33:33:*, while IPv4 uses 01:00:5e:*. There are other widely-used prefixes, see this Wikipedia table for details.
For IPv6 multicast addresses, the last 32 bits of the IPv6 address are OR'd with 33:33:00:00:00:00. For example:
The "all nodes" address
ff02::1is converted to33:33:00:00:00:01.Neighbour solicitations for an example address
fe80::4a5d:60ff:fee8:658fare sent to the corresponding Solicited-Node multicast addressff02::1:ffe8:658f, which is converted to Ethernet address33:33:ff:e8:65:8f.
This is described in RFC 2624 section 7.
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
As a side note, the "all nodes" address is in practice treated as broadcast, since MLD is not used for it.
– grawity
Sep 29 '17 at 4:50
add a comment |
The function of arp is replace by Neighbour Solicitation in IPv6.
This article explains it best if you understand address allocation.
Ipv6 Neighbour Solicitation
Updated Link because of Blog Refactor:
edited Jan 15 at 1:05
Trevor
1636
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
add a comment |
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2 Answers
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2 Answers
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Ethernet has "multicast" MAC addresses as well – any MAC address with the "group" bit set is technically a multicast address; IPv6 uses the prefix 33:33:*, while IPv4 uses 01:00:5e:*. There are other widely-used prefixes, see this Wikipedia table for details.
For IPv6 multicast addresses, the last 32 bits of the IPv6 address are OR'd with 33:33:00:00:00:00. For example:
The "all nodes" address
ff02::1is converted to33:33:00:00:00:01.Neighbour solicitations for an example address
fe80::4a5d:60ff:fee8:658fare sent to the corresponding Solicited-Node multicast addressff02::1:ffe8:658f, which is converted to Ethernet address33:33:ff:e8:65:8f.
This is described in RFC 2624 section 7.
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
As a side note, the "all nodes" address is in practice treated as broadcast, since MLD is not used for it.
– grawity
Sep 29 '17 at 4:50
add a comment |
Ethernet has "multicast" MAC addresses as well – any MAC address with the "group" bit set is technically a multicast address; IPv6 uses the prefix 33:33:*, while IPv4 uses 01:00:5e:*. There are other widely-used prefixes, see this Wikipedia table for details.
For IPv6 multicast addresses, the last 32 bits of the IPv6 address are OR'd with 33:33:00:00:00:00. For example:
The "all nodes" address
ff02::1is converted to33:33:00:00:00:01.Neighbour solicitations for an example address
fe80::4a5d:60ff:fee8:658fare sent to the corresponding Solicited-Node multicast addressff02::1:ffe8:658f, which is converted to Ethernet address33:33:ff:e8:65:8f.
This is described in RFC 2624 section 7.
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
As a side note, the "all nodes" address is in practice treated as broadcast, since MLD is not used for it.
– grawity
Sep 29 '17 at 4:50
add a comment |
Ethernet has "multicast" MAC addresses as well – any MAC address with the "group" bit set is technically a multicast address; IPv6 uses the prefix 33:33:*, while IPv4 uses 01:00:5e:*. There are other widely-used prefixes, see this Wikipedia table for details.
For IPv6 multicast addresses, the last 32 bits of the IPv6 address are OR'd with 33:33:00:00:00:00. For example:
The "all nodes" address
ff02::1is converted to33:33:00:00:00:01.Neighbour solicitations for an example address
fe80::4a5d:60ff:fee8:658fare sent to the corresponding Solicited-Node multicast addressff02::1:ffe8:658f, which is converted to Ethernet address33:33:ff:e8:65:8f.
This is described in RFC 2624 section 7.
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
Ethernet has "multicast" MAC addresses as well – any MAC address with the "group" bit set is technically a multicast address; IPv6 uses the prefix 33:33:*, while IPv4 uses 01:00:5e:*. There are other widely-used prefixes, see this Wikipedia table for details.
For IPv6 multicast addresses, the last 32 bits of the IPv6 address are OR'd with 33:33:00:00:00:00. For example:
The "all nodes" address
ff02::1is converted to33:33:00:00:00:01.Neighbour solicitations for an example address
fe80::4a5d:60ff:fee8:658fare sent to the corresponding Solicited-Node multicast addressff02::1:ffe8:658f, which is converted to Ethernet address33:33:ff:e8:65:8f.
This is described in RFC 2624 section 7.
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
edited Sep 29 '17 at 4:53
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
answered Sep 10 '14 at 12:04
grawitygrawity
238k37505560
238k37505560
As a side note, the "all nodes" address is in practice treated as broadcast, since MLD is not used for it.
– grawity
Sep 29 '17 at 4:50
add a comment |
As a side note, the "all nodes" address is in practice treated as broadcast, since MLD is not used for it.
– grawity
Sep 29 '17 at 4:50
As a side note, the "all nodes" address is in practice treated as broadcast, since MLD is not used for it.
– grawity
Sep 29 '17 at 4:50
As a side note, the "all nodes" address is in practice treated as broadcast, since MLD is not used for it.
– grawity
Sep 29 '17 at 4:50
add a comment |
The function of arp is replace by Neighbour Solicitation in IPv6.
This article explains it best if you understand address allocation.
Ipv6 Neighbour Solicitation
Updated Link because of Blog Refactor:
edited Jan 15 at 1:05
Trevor
1636
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
add a comment |
The function of arp is replace by Neighbour Solicitation in IPv6.
This article explains it best if you understand address allocation.
Ipv6 Neighbour Solicitation
Updated Link because of Blog Refactor:
edited Jan 15 at 1:05
Trevor
1636
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
add a comment |
The function of arp is replace by Neighbour Solicitation in IPv6.
This article explains it best if you understand address allocation.
Ipv6 Neighbour Solicitation
Updated Link because of Blog Refactor:
edited Jan 15 at 1:05
Trevor
1636
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
The function of arp is replace by Neighbour Solicitation in IPv6.
This article explains it best if you understand address allocation.
Ipv6 Neighbour Solicitation
Updated Link because of Blog Refactor:
edited Jan 15 at 1:05
Trevor
1636
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
edited Jan 15 at 1:05
Trevor
1636
edited Jan 15 at 1:05
Trevor
1636
edited Jan 15 at 1:05
Trevor
1636
1636
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
answered Sep 10 '14 at 11:08
YetiFiascoYetiFiasco
49528
49528
add a comment |
add a comment |
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