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⇤ ← Revision 1 as of 2003-09-25 18:30:57
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| '''CIDR'' (ClasslessInterDomainRouting) allows us to aggregate subnets for routing purposes. Thus if we have 8 class C networks (x.x.0.0 - x.x.7.255) assigned to a ISP, and we could route to that ISP with one routing entry x.x.0 with network length 11. If the next eight were assigned to someone else we could have a rouing entry for them of x.x.8.0 length 11 also. | '''CIDR''' (ClasslessInterDomainRouting) allows us to aggregate subnets for routing purposes. Thus if we have 8 class C networks (x.x.0.0 - x.x.7.255) assigned to a ISP, and we could route to that ISP with one routing entry x.x.0 with network length 11. If the next eight were assigned to someone else we could have a rouing entry for them of x.x.8.0 length 11 also. |
CIDR vs Subnetting
SubNetting is a way of assigning some entity a smaller number of IP addresses than a class C. The provides for a more efficient use of IP addresses.
CIDR (ClasslessInterDomainRouting) allows us to aggregate subnets for routing purposes. Thus if we have 8 class C networks (x.x.0.0 - x.x.7.255) assigned to a ISP, and we could route to that ISP with one routing entry x.x.0 with network length 11. If the next eight were assigned to someone else we could have a rouing entry for them of x.x.8.0 length 11 also.