[c-nsp] separate ipv6 prefix delegation

Nikolay Shopik shopik at inblock.ru
Fri Jul 12 06:40:13 EDT 2013


ISP announce two separate /64 prefixes via DHCP-PD. I import them using
ipv6 dhcp client pd ISP6_PREFIX. Then using command ipv6 address
ISP-PREFIX ::1/64 to assing it on lan interface.

And its assign both prefixes on interface and thus all machines have 2
separate IPv6 addresses in both prefixes. Is there way I can use only 1
/64 prefix from what ISP announce to me via DHCP-PD?

15.2(4)M3 here.

interface Virtual-PPP1
 bandwidth 40000
 ip address negotiated
 ip access-group 111 in
 ip access-group 112 out
 no ip redirects
 no ip proxy-arp
 ip mtu 1460
 ip nat outside
 no ip virtual-reassembly in
 ip tcp adjust-mss 1420
 no peer neighbor-route
 ipv6 address autoconfig default
 ipv6 enable
 ipv6 mtu 1460
 ipv6 dhcp client pd ISP6_PREFIX
 ppp chap hostname YARR
 ppp chap password 0 YARR
 no cdp enable
 pseudowire 10 pw-class ISP
interface Vlan1
 description LAN
 ip address
 ip pim dense-mode
 ip nat inside
 no ip virtual-reassembly in
 ip igmp helper-address
 ipv6 address ISP6_PREFIX ::1/64
 ipv6 nd other-config-flag
 ipv6 dhcp server dhcpv6-pool

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