Hi, As per RFC8415 section 21.6, IA Address option 5 offered by the server specifying (temporary or not) address, may appear more than once so the client can be offered more than one address to use.
This is supported by AWS EC2 (aws ec2 assign-ipv6-addresses
--ipv6-address-count), allowing to segment IP address for different
usage (container, application specific ..) where DHCP reply look like
the following (full pcap attached):
Identity Association for Non-temporary Address
Option: Identity Association for Non-temporary Address (3)
Length: 96
IAID: 16092fc9
T1: 70
T2: 112
IA Address
Option: IA Address (5)
Length: 24
IPv6 address: 2a05:d018:c28:1a00::e564
Preferred lifetime: 140
Valid lifetime: 450
IA Address
Option: IA Address (5)
Length: 24
IPv6 address: 2a05:d018:c28:1a00::3504
Preferred lifetime: 140
Valid lifetime: 450
IA Address
Option: IA Address (5)
Length: 24
IPv6 address: 2a05:d018:c28:1a00::3501
Preferred lifetime: 140
Valid lifetime: 450
Looking at replicating such setup with dnsmasq, --dhcp-host
documentation specifies "A single --dhcp-host may contain an IPv4
address or one or more IPv6 addresses, or both" by providing a prefix
length. However it appears dnsmasq only ever assign a single address to
the client based on DUID.
Is my understand correct ? How could dnsmasq be configured to return
multiple IA option 5 for a given client ?
Thanks,
--
Bertrand
dhcp.pcap
Description: application/vnd.tcpdump.pcap
signature.asc
Description: PGP signature
_______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
