commit 002c000e52286a60b436b94a392abd80fae44278
parent e55a71898e909f97fed5ff163391dcc3b5606fd0
Author: pyratebeard <root@pyratebeard.net>
Date: Wed, 5 Jun 2019 12:47:32 +0100
updated formatting
Diffstat:
1 file changed, 27 insertions(+), 11 deletions(-)
diff --git a/technology/networking/subnet_cheatsheet.md b/technology/networking/subnet_cheatsheet.md
@@ -2,6 +2,7 @@
https://oav.net/mirrors/cidr.html
+```
Netmask Netmask (binary) CIDR Notes
_____________________________________________________________________________
255.255.255.255 11111111.11111111.11111111.11111111 /32 Host (single addr)
@@ -40,7 +41,9 @@ _____________________________________________________________________________
192.0.0.0 11000000.00000000.00000000.00000000 /2
128.0.0.0 10000000.00000000.00000000.00000000 /1
0.0.0.0 00000000.00000000.00000000.00000000 /0 IP space
+```
+```
Net Host Total
Net Addr Addr Addr Number
Class Range NetMask Bits Bits of hosts
@@ -59,8 +62,10 @@ K 222-223 255.255.255.254 31 1 2 (reserved)
(ref: RFC1375 & http://www.iana.org/assignments/ipv4-address-space )
( http://www.iana.org/numbers.htm )
----------------------------------------------------------
+```
The current list of special use prefixes:
+```
0.0.0.0/8
127.0.0.0/8
192.0.2.0/24
@@ -69,14 +74,16 @@ The current list of special use prefixes:
192.168.0.0/16
169.254.0.0/16
all D/E space
-(ref: RFC1918 http://www.rfc-editor.org/rfc/rfc1918.txt )
-( or ftp://ftp.isi.edu/in-notes/rfc1918.txt )
-(rfc search: http://www.rfc-editor.org/rfcsearch.html )
-( http://www.ietf.org/ietf/1id-abstracts.txt )
-( http://www.ietf.org/shadow.html )
+```
+- (ref: RFC1918 http://www.rfc-editor.org/rfc/rfc1918.txt )
+- ( or ftp://ftp.isi.edu/in-notes/rfc1918.txt )
+- (rfc search: http://www.rfc-editor.org/rfcsearch.html )
+- ( http://www.ietf.org/ietf/1id-abstracts.txt )
+- ( http://www.ietf.org/shadow.html )
Martians: (updates at: www.iana.org/assignments/ipv4-address-space )
+```
no ip source-route
access-list 100 deny ip host 0.0.0.0 any
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 )
deny ip 224.0.0.0 15.255.255.255 any log ! unless MBGP-learned routes
deny ip 224-239/8 0.255.255.255 any log ! IANA - Multicast
deny ip 240-255/8 0.255.255.255 any log ! IANA - Reserved
+```
+```
filtered source addresses
0/8 ! broadcast
10/8 ! RFC 1918 private
@@ -127,8 +136,10 @@ filtered source addresses
240.0.0.0/5 ! class E reserved
248.0.0.0/5 ! reserved
255.255.255.255/32 ! broadcast
+```
ARIN administrated blocks: (http://www.arin.net/regserv/IPStats.html)
+```
24.0.0.0/8 (portions of)
63.0.0.0/8
64.0.0.0/8
@@ -145,16 +156,18 @@ ARIN administrated blocks: (http://www.arin.net/regserv/IPStats.html)
208.0.0.0/8
209.0.0.0/8
216.0.0.0/8
+```
----------------------------------------------------------
well known ports: (rfc1700.txt)
- www.iana.org/assignments/port-numbers
+ - www.iana.org/assignments/port-numbers
protocol numbers:
- www.iana.org/assignments/protocol-numbers
- www.iana.org/numbers.htm
+ - www.iana.org/assignments/protocol-numbers
+ - www.iana.org/numbers.htm
ICMP(Types/Codes)
+```
Testing Destination Reachability & Status
(0/0) Echo-Reply
(8/0) Echo
@@ -205,12 +218,14 @@ ICMP(Types/Codes)
(30/0) Traceroute
(31/0) Conversion-Error
(32/0) Mobile-Redirect
+```
Ref: [RFC 792] [RFC 896] [RFC 950] [RFC 1016]
www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_5_3/cofigide/qos.htm#19774
+```
Decimal system Prefix's
Factor Exponent Prefix
---------------------------------------------------
@@ -236,9 +251,10 @@ Decimal system Prefix's
0.000 000 000 000 000 000 000 001...10^-24...yocto
---------------------------------------------------
-Convert Fahrenheit <> Celsius:
- Celsius = (Fahrenheit - 32) / 1.8
- Fahrenheit = (Celsius * 1.8) + 32
+```
+- Convert Fahrenheit <> Celsius:
+ - Celsius = (Fahrenheit - 32) / 1.8
+ - Fahrenheit = (Celsius * 1.8) + 32
last updated: 4jul02
