02-18-2013 10:22 AM - edited 03-01-2019 05:39 PM
Dear All,
can i use this ip address as private ip address
L0: 2001:192:168:100::1/128
and the point to point ipv4 address is: 192.168.1.0/30 can i use 2001: 192:168:1::1/126
because i am using IPv4 address 192.168.100.1/32.
if not what must i use it to acheive my setup
Thanks,
02-19-2013 07:24 AM
That would be a bad idea, as 2001::/16 is already allocated by IANA and is globally routed. It won't be a prefix your ISP is willing to route for you, and if it escapes, probably someone else is already using it.
If you want a non-routable private v6 address, you have two main choices:
(1) for Link-local use only, you can use your automatically configured lihk-scope fe80::/64 address.
Typically the host part (bottom 64 bits) will use the EUI-64 mapping off your ethernet MAC, which is, insert fffe in the middle and flip the global/local flag bit.
(2) For site-scope, use RFC-4192 unique local addresses, which are the v6 replacement for RFC-1918 v6 private addresses. They will look like fd+40 random bits as a /48 prefix, then you allocate the bottom 80 bits as your usual 16 bits of subnetting and 64 bits of host part.
If you want a non-routable documentation address, the v6 range for published examples is 2001:db8::/32.
People who want to embed v4 bits into v6 addresses usually put them at the bottom of the host part, so you could use whatever prefix you end up with and host part ::192.168.1.1 (0000:0000:c0a8:6401).
-- Jim Leinweber, WI State Lab of Hygiene
02-19-2013 10:42 PM
You can use as private but you cant use it as public.you can use unique local addresses with startin fc0:: space
Sent from Cisco Technical Support Android App
02-20-2013 02:49 PM
Dear All,
Can you tell me what is the IPv6 subnet can use it for enterprise inteast of the IPv4?
for example
IPv4 --- loopback:192.168.1.1/32 what is the equivelent for ipV6
IPv6 p2p ---- 192.168.2.0/30 what is the equivelent for IPv6
thanks in advanced
02-21-2013 11:04 AM
Some address classes compared between IPv4 and IPv6
loopback: v4 127.0.0.1/8, v6 ::1/128
link-local zeroconf: v4 169.254.0.0/16, v6 fe80::/64
private, site-scope, not globally routeable:
v4: rfc-1918, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8
v6: rfc-4192: fdxx:yyyy:zzzz::/48, where xx:yyyy:zzzz are local chosen once, psuedo-randomly
multicast: v4: 224.0.0.0/4 v6: ff00::/8
If you have a router which is using 192.168.1.1 as its gateway address and a tunnel which is using 192.168.2.0/30 as a transit subnet for point to point link, the questions are:
* does the router support IPv6? If so, it should be sending ICMPv6 router advertisements (message type 134), which will exhibit the link-local address of the gateway (fe80::....) as the IPv6 sender.
* does the tunnel support IPv6? If so, it will probably be configured with an IPv6 transit subnet either /46 or /127 in size, probably using a putatively globally routable prefix starting with 2::/3. What you should use locally depends on what the remote end is willing to offer.
If you could provide more details about the network topology and devices and ISP, we might be able to offer more specific advice.
-- Jim Leinweber, WI State Lab of Hygiene
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