002c000e52286a60b436b94a392abd80fae44278
technology/networking/subnet_cheatsheet.md
... | ... | @@ -2,6 +2,7 @@ |
2 | 2 | |
3 | 3 | https://oav.net/mirrors/cidr.html |
4 | 4 | |
5 | +``` |
|
5 | 6 | Netmask Netmask (binary) CIDR Notes |
6 | 7 | _____________________________________________________________________________ |
7 | 8 | 255.255.255.255 11111111.11111111.11111111.11111111 /32 Host (single addr) |
... | ... | @@ -40,7 +41,9 @@ _____________________________________________________________________________ |
40 | 41 | 192.0.0.0 11000000.00000000.00000000.00000000 /2 |
41 | 42 | 128.0.0.0 10000000.00000000.00000000.00000000 /1 |
42 | 43 | 0.0.0.0 00000000.00000000.00000000.00000000 /0 IP space |
44 | +``` |
|
43 | 45 | |
46 | +``` |
|
44 | 47 | Net Host Total |
45 | 48 | Net Addr Addr Addr Number |
46 | 49 | Class Range NetMask Bits Bits of hosts |
... | ... | @@ -59,8 +62,10 @@ K 222-223 255.255.255.254 31 1 2 (reserved) |
59 | 62 | (ref: RFC1375 & http://www.iana.org/assignments/ipv4-address-space ) |
60 | 63 | ( http://www.iana.org/numbers.htm ) |
61 | 64 | ---------------------------------------------------------- |
65 | +``` |
|
62 | 66 | |
63 | 67 | The current list of special use prefixes: |
68 | +``` |
|
64 | 69 | 0.0.0.0/8 |
65 | 70 | 127.0.0.0/8 |
66 | 71 | 192.0.2.0/24 |
... | ... | @@ -69,14 +74,16 @@ The current list of special use prefixes: |
69 | 74 | 192.168.0.0/16 |
70 | 75 | 169.254.0.0/16 |
71 | 76 | all D/E space |
72 | -(ref: RFC1918 http://www.rfc-editor.org/rfc/rfc1918.txt ) |
|
73 | -( or ftp://ftp.isi.edu/in-notes/rfc1918.txt ) |
|
74 | -(rfc search: http://www.rfc-editor.org/rfcsearch.html ) |
|
75 | -( http://www.ietf.org/ietf/1id-abstracts.txt ) |
|
76 | -( http://www.ietf.org/shadow.html ) |
|
77 | +``` |
|
78 | +- (ref: RFC1918 http://www.rfc-editor.org/rfc/rfc1918.txt ) |
|
79 | +- ( or ftp://ftp.isi.edu/in-notes/rfc1918.txt ) |
|
80 | +- (rfc search: http://www.rfc-editor.org/rfcsearch.html ) |
|
81 | +- ( http://www.ietf.org/ietf/1id-abstracts.txt ) |
|
82 | +- ( http://www.ietf.org/shadow.html ) |
|
77 | 83 | |
78 | 84 | |
79 | 85 | Martians: (updates at: www.iana.org/assignments/ipv4-address-space ) |
86 | +``` |
|
80 | 87 | no ip source-route |
81 | 88 | access-list 100 deny ip host 0.0.0.0 any |
82 | 89 | deny ip 0.0.0.0 0.255.255.255 any log ! antispoof |
... | ... | @@ -114,7 +121,9 @@ Martians: (updates at: www.iana.org/assignments/ipv4-address-space ) |
114 | 121 | deny ip 224.0.0.0 15.255.255.255 any log ! unless MBGP-learned routes |
115 | 122 | deny ip 224-239/8 0.255.255.255 any log ! IANA - Multicast |
116 | 123 | deny ip 240-255/8 0.255.255.255 any log ! IANA - Reserved |
124 | +``` |
|
117 | 125 | |
126 | +``` |
|
118 | 127 | filtered source addresses |
119 | 128 | 0/8 ! broadcast |
120 | 129 | 10/8 ! RFC 1918 private |
... | ... | @@ -127,8 +136,10 @@ filtered source addresses |
127 | 136 | 240.0.0.0/5 ! class E reserved |
128 | 137 | 248.0.0.0/5 ! reserved |
129 | 138 | 255.255.255.255/32 ! broadcast |
139 | +``` |
|
130 | 140 | |
131 | 141 | ARIN administrated blocks: (http://www.arin.net/regserv/IPStats.html) |
142 | +``` |
|
132 | 143 | 24.0.0.0/8 (portions of) |
133 | 144 | 63.0.0.0/8 |
134 | 145 | 64.0.0.0/8 |
... | ... | @@ -145,16 +156,18 @@ ARIN administrated blocks: (http://www.arin.net/regserv/IPStats.html) |
145 | 156 | 208.0.0.0/8 |
146 | 157 | 209.0.0.0/8 |
147 | 158 | 216.0.0.0/8 |
159 | +``` |
|
148 | 160 | ---------------------------------------------------------- |
149 | 161 | |
150 | 162 | well known ports: (rfc1700.txt) |
151 | - www.iana.org/assignments/port-numbers |
|
163 | + - www.iana.org/assignments/port-numbers |
|
152 | 164 | |
153 | 165 | protocol numbers: |
154 | - www.iana.org/assignments/protocol-numbers |
|
155 | - www.iana.org/numbers.htm |
|
166 | + - www.iana.org/assignments/protocol-numbers |
|
167 | + - www.iana.org/numbers.htm |
|
156 | 168 | |
157 | 169 | ICMP(Types/Codes) |
170 | +``` |
|
158 | 171 | Testing Destination Reachability & Status |
159 | 172 | (0/0) Echo-Reply |
160 | 173 | (8/0) Echo |
... | ... | @@ -205,12 +218,14 @@ ICMP(Types/Codes) |
205 | 218 | (30/0) Traceroute |
206 | 219 | (31/0) Conversion-Error |
207 | 220 | (32/0) Mobile-Redirect |
221 | +``` |
|
208 | 222 | |
209 | 223 | Ref: [RFC 792] [RFC 896] [RFC 950] [RFC 1016] |
210 | 224 | www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_5_3/cofigide/qos.htm#19774 |
211 | 225 | |
212 | 226 | |
213 | 227 | |
228 | +``` |
|
214 | 229 | Decimal system Prefix's |
215 | 230 | Factor Exponent Prefix |
216 | 231 | --------------------------------------------------- |
... | ... | @@ -236,9 +251,10 @@ Decimal system Prefix's |
236 | 251 | 0.000 000 000 000 000 000 000 001...10^-24...yocto |
237 | 252 | --------------------------------------------------- |
238 | 253 | |
239 | -Convert Fahrenheit <> Celsius: |
|
240 | - Celsius = (Fahrenheit - 32) / 1.8 |
|
241 | - Fahrenheit = (Celsius * 1.8) + 32 |
|
254 | +``` |
|
255 | +- Convert Fahrenheit <> Celsius: |
|
256 | + - Celsius = (Fahrenheit - 32) / 1.8 |
|
257 | + - Fahrenheit = (Celsius * 1.8) + 32 |
|
242 | 258 | |
243 | 259 | |
244 | 260 | last updated: 4jul02 |