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Bug #4483

closed

SLAAC and stateful DHCP6 IPs are configured on interface when using DHCP6 config type

Added by Paul K almost 10 years ago. Updated over 9 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
-
Category:
DHCP (IPv6)
Target version:
2.2.3
Start date:
03/02/2015
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
All
Affected Architecture:

Description

If I set my WAN IPv6 configuration type to DHCP6 and leave 'Request only a IPv6 prefix' unchecked I end up with two public v6 IPs on WAN interface:

vmx0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=60009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 00:aa:bb:cc:dd:ee
        inet6 fe80::2aa:bbff:fecc:ddee%vmx0 prefixlen 64 scopeid 0x1 
        inet 111.222.132.250 netmask 0xfffffc00 broadcast 111.222.135.255 
        inet6 xxxx:yyy:zzzz:4fa0:2aa:bbff:fecc:ddee prefixlen 64 autoconf 
        inet6 xxxx:yyy:zzzz:4fa0::48 prefixlen 128 
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active

xxxx:yyy:zzzz:4fa0::48 is assigned by DHCP server
xxxx:yyy:zzzz:4fa0:2aa:bbff:fecc:ddee is auto-configured. pfSense WAN is connected to modem that sends out RA messages.

This happens because function interface_dhcpv6_configure is called for slaac and dhcp6 configurations and enables RA acceptance regardless of the config type.

If I check 'Request only a IPv6 prefix' flag so that pfSense doesn't request stateful address from DHCP server I end up with SLAAC IP only. However Interfaces widget on the dashboard shows link-local address instead of SLAAC address and firewall rules that use 'WAN net' or 'WAN address' use link-local address as well. Looking at the code I see that get_interface_ipv6 function assumes that there is no public IP if 'dhcp6prefixonly' flag is set.

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