OK I am running solaris 10.
I made some changes to my ipf.conf file and issued the command:
ipf -Fa -f /etc/ipf/ipf.conf
to flush out the old and bring in the new changes.
When I ran ipfstat -ioh to verify it had brought in the new rule set I saw something I wasn't expecting to see.
I had entries in the ipf.conf file like this ( NOTE: I replaced the actual ip's used partially with #'s to protect the server info):
pass in quick on eri0 proto tcp from ##.##.###.10 to ##.##.###.33 port = 8080 keep state
when I ran the ipfstat command I got this:
pass in quick on eri0 proto tcp from ##.##.###.10/32 to ##.##.###.33/32 port = 8080 keep state
So my question is, and I apologize if it is a stupid question, this is still all a bit new to me, but what is the /32 part it added to my ip's?
seg
2
/32 means 'this ip and only this ip'. CIDR notation and subnet-ting explain the guts of it.
Neo
3
32 = X-network-bits + Y-host-bits
Addresses = 2 ^ Y-host-bits
--------------------------------------------------------------
CIDR Total number Network Description:
Notation: of addresses: Mask:
--------------------------------------------------------------
/0 4,294,967,296 0.0.0.0 Every Address
/1 2,147,483,648 128.0.0.0 128 /8 nets
/2 1,073,741,824 192.0.0.0 64 /8 nets
/3 536,870,912 224.0.0.0 32 /8 nets
/4 268,435,456 240.0.0.0 16 /8 nets
/5 134,217,728 248.0.0.0 8 /8 nets
/6 67,108,864 252.0.0.0 4 /8 nets
/7 33,554,432 254.0.0.0 2 /8 nets
/8 16,777,214 255.0.0.0 1 /8 net
--------------------------------------------------------------
/9 8,388,608 255.128.0.0 128 /16 nets
/10 4,194,304 255.192.0.0 64 /16 nets
/11 2,097,152 255.224.0.0 32 /16 nets
/12 1,048,576 255.240.0.0 16 /16 nets
/13 524,288 255.248.0.0 8 /16 nets
/14 262,144 255.252.0.0 4 /16 nets
/15 131.072 255.254.0.0 2 /16 nets
/16 65,536 255.255.0.0 1 /16
--------------------------------------------------------------
/17 32,768 255.255.128.0 128 /24 nets
/18 16,384 255.255.192.0 64 /24 nets
/19 8,192 255.255.224.0 32 /24 nets
/20 4,096 255.255.240.0 16 /24 nets
/21 2,048 255.255.248.0 8 /24 nets
/22 1,024 255.255.252.0 4 /24 nets
/23 512 255.255.254.0 2 /24 nets
/24 256 255.255.255.0 1 /24
--------------------------------------------------------------
/25 128 255.255.255.128 Half of a /24
/26 64 255.255.255.192 Fourth of a /24
/27 32 255.255.255.224 Eighth of a /24
/28 16 255.255.255.240 1/16th of a /24
/29 8 255.255.255.248 5 Usable addresses
/30 4 255.255.255.252 1 Usable address
/31 2 255.255.255.254 Unusable
/32 1 255.255.255.255 Single host
--------------------------------------------------------------
Reference:
A chart describing CIDR subnets
See also, Wikipedia on CIDR.