Supernet block sizes - recommendations?
I recently received a request from one of our sites for a block of 256 network numbers from one of our supernet blocks and have been hesitant to fill it because of the relatively large fraction of the current NIC-allocated maximum lock size (1024 networks) it represents. If I recall correctly, at the Boulder Regional Techs meeting, we talked about "reasonable" block sizes in the 32 to 64 network range. Has anyone thought more about this issue or considered what we should recommend either for the maximum block size to reallocate to our clients or the maximum block size the NIC should allocate to us? --Vince
I just had one of our customers turn in two class B addresses in exchange for 130 C's. I'll make the trade,because it allows me to chunk the whole CIDR block as a single entry, instead of two disconnected B's. Two observations: 1. The NIC ought to take a stonger position to refer requests to folks with allocated CIDR blocks. I have had four sites turn in individual C's for numbers from our block. 2. Once folks know this is possible, and works well, these numbers vanish. Perhaps this is only because we are working with state agencies who are building internal networks. -- Regards, Bill Manning bmanning@rice.edu PO Box 1892 713-285-5415 713-527-6099 Houston, Texas R.U. (o-kome) 77251-1892
Bill, You should probably forward your suggestion for encouraging people to get their addresses from CIDR blocks to the NIC and to the IANA. cheers, peter
I have. Twice. I am -assuming- that things are going well. It does not hurt to get others involved as well. -- Regards, Bill Manning bmanning@rice.edu PO Box 1892 713-285-5415 713-527-6099 Houston, Texas R.U. (o-kome) 77251-1892
peter@goshawk.lanl.gov writes: * * Bill, * * You should probably forward your suggestion for encouraging people to get * their addresses from CIDR blocks to the NIC and to the IANA. We feel the same way. We delegate maximum of 1 block of 256 class Cs at a time to service providers and other registries. We keep more blocks reserved for them based on their 2 year class C usage estimate, but do not hand all these over at once. If registries get requests for large amounts of address space (typically 256 Class Cs or more) they usually send the customer directly to us, or we provide an extra block to the registry to fulfill the customer's request, not necessarily in the "bigger" supernet block of the provider. I think in the US, a good interaction between the service providers and IANA/NIC could result in a similar scheme, which has worked quite well in Europe so far. -Marten
peter@goshawk.lanl.gov writes: * * Bill, * * You should probably forward your suggestion for encouraging people to get * their addresses from CIDR blocks to the NIC and to the IANA.
these over at once. If registries get requests for large amounts of address space (typically 256 Class Cs or more) they usually send the customer directly to us, or we provide an extra block to the registry to fulfill the
Same here. For large chunks of class C's, we send the end site directly to the NIC. Its just hard convincing the end sites the 'merits' of a chunk of class C addresses for them-- too many are just too caught up in the 'prestige' involved in getting a class B network... if only someone could tell all those 'consultants' advising these end sites to get class B's... ;-) -vikas vikas@jvnc.net
From Vince Fuller:
I recently received a request from one of our sites for a block of 256 network numbers from one of our supernet blocks and have been hesitant to fill it because of the relatively large fraction of the current NIC-allocated maximum
How large are the supernet blocks that you are getting from the NIC ? -vikas vikas@jvnc.net
participants (5)
-
aggarwal＠nisc.jvnc.net -
bmanning＠is.rice.edu -
Marten Terpstra -
peter＠goshawk.lanl.gov -
Vince Fuller