I am trying to set a static suffix for my device but it is not working properly. Setting 192.168.1.10 also gives it a static ::10 ipv6 address and I want to set a static random IPv6 address chosen by me, I tried be51:07fa:f822:38d7 but suffix only gets be51, then I tried be5107faf82238d7 and that still does not work. Is it limited to first 4 characters? I want to define my own complete suffix for a device, it is possible to set?
Sure it is, but I've seen limited success myself with it.
option name 'mnemosyne'
option mac 'xxxx:xx:xx:xx:xx'
option duid '00010001f98caa01274d4356eff08'
option hostid '25'
This would assign to the client with DUID 00010001f98caa01274d4356eff08 a 25 suffix. I have it working with a few clients, but on others it's not even showing a DUID in the DHCP server's logs or lease files, so it's a bit hit an miss.
The DUID is important to link the suffix you like afaik.
- Suffix only works for clients doing stateful DHCPv6, it has no effect on systems not doing DHCP but SLAAC only, e.g. Android
- The hostid suffix value is limited to 32bit, so the maximum possible value is ffffffff
That's because scanning the number stops at the first non-digit, so only
be51 gets used in this case.
That value is too large to fit into a 32bit integer.
f82238d7 would work.
Is there any reason why it is limited to 32bit and not use 64bit integer.
I found this while searching for a solution, looks like the solution would be to use a 64 bit variable and not a 32 bit one. Hopefully it will be implemented soon.
Because that's how it's defined in the RFCs:
Also (unless I misunderstood), you are aware that if you assigned a 64-bit "suffix"...the proper term wouldn't be "suffix", correct?
Prefix would be assigned by ISP I am talking about the last 64 bits set by me for my Raspberry, which would be suffix.
That depends on the length they issued to you.
This is called a "Static IP Address". You set that on the host (i.e. the Raspberry).
(Yes, there's certainly an RFC about that too.)