Code point range | UTF-8 | UTF-16 | |||||
---|---|---|---|---|---|---|---|
hexadecimal | binary |
Bytes (code bits) |
binary | hexadecimal |
Bytes (code bits) |
binary | hexadecimal |
00 00 00 —00 00 7F
|
0000 0000 0000 0000 0000 0000 —0000 0000 0000 0000 0111 1111
|
1 (7) |
0xxx xxxx
|
00 —7F
|
2 (16) |
xxxx xxxx xxxx xxxx
|
00 00 —FF FF
|
00 00 80 —00 07 FF
|
0000 0000 0000 0000 1000 0000 —0000 0000 0000 0111 1111 1111
|
2 (11) |
110x xxxx 10xx xxxx
|
C2 80 —DF BF
|
|||
00 08 00 —00 FF FF
|
0000 0000 0000 1000 0000 0000 —0000 0000 1111 1111 1111 1111
|
3 (16) |
1110 xxxx 10xx xxxx 10xx xxxx
|
E0 A0 80 —EF BF BF
|
|||
01 00 00 —10 FF FF
|
0000 0001 0000 0000 0000 0000 —0001 0000 1111 1111 1111 1111
|
4 (21) |
1111 0xxx 10xx xxxx 10xx xxxx 10xx xxxx
|
F0 90 80 80 —F4 8F BF BF
|
4 (20) |
1101 10xx xxxx xxxx 1101 11xx xxxx xxxx
|
D8 00 DC 00 —DB FF DF FF
|
Tag Archives: mac os
Test Jumbo Frames / MTU 9000
Linux:
ping -M do -s 8972 xxx.xxx.xxx.xxx
OSX/BSD:
ping -D -s 8184 xxx.xxx.xxx.xxx
Windows:
ping -f -l 9000 xxx.xxx.xxx.xxx
Example results on Linux
If you’ve forgotten to enable jumbo frames/9k MTU on your client device you’re sending the ping from:
PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes ping: sendto: Message too long
If you have enabled jumbo frames on your client but not the destination (or a switch in between):
PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes Request timeout for icmp_seq 0
If you’ve done everything righ:
PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes 8192 bytes from xxx.xxx.xxx.xxx: icmp_seq=0 ttl=128 time=0.714 ms
WebDAV with cURL
Assuming the following Data:
- Webdav URL: http://example.com/webdav
- Username: user
- Password: pass
Actions
Reading Files/Folders
curl 'http://example.com/webdav'
Creating new Folder
curl -X MKCOL 'http://example.com/webdav/new_folder'
Uploading File
curl -T '/path/to/local/file.txt' 'http://example.com/webdav/test/new_name.txt'
Renaming File
curl -X MOVE --header 'Destination:http://example.org/webdav/new.txt' 'http://example.com/webdav/old.txt'
Deleting Files/Folders
File:
curl -X DELETE 'http://example.com/webdav/test.txt'
Folder:
curl -X DELETE 'http://example.com/webdav/test'
List Files in a Folder
curl -i -X PROPFIND http://example.com/webdav/ --upload-file - -H "Depth: 1" <<end <?xml version="1.0"?> <a:propfind xmlns:a="DAV:"> <a:prop><a:resourcetype/></a:prop> </a:propfind> end
Mount disk image partition
View partition table of disk.img:
fdisk -lu disk.img
Disk disk.img: 1.3 GiB, 1361051648 bytes, 2658304 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x6f92008e Device Boot Start End Sectors Size Id Type disk.img1 8192 131071 122880 60M c W95 FAT32 (LBA) disk.img2 131072 2658303 2527232 1.2G 83 Linux
Mount partition by using start multiplied by sector size as offset
mount -o loop,offset=$((131072 * 512))
DNS Fun
calc
A calculator supporting addition, substraction, multiplication and division (respectively : ADD, SUB ,MUL, and DIV operations). More information here.
dig 2.8.add.calc.postel.org @dns.postel.org +short
0.10.0.0
dig 8.2.sub.calc.postel.org @dns.postel.org +short
0.6.0.0
dig 2.8.mul.calc.postel.org @dns.postel.org +short
0.16.0.0
dig 8.2.div.calc.postel.org @dns.postel.org +short
0.4.0.0
IP to ASN Mapping
A service providing a way to map IPv4 and IPv6 addresses or prefixs to ASNs, get information about ASNs, and even find possible peers. More details here.
Mapping an IP address or prefix to a corresponding BGP Origin ASN:
dig 4.4.8.8.origin.asn.cymru.com TXT +short
"15169 | 8.8.4.0/24 | US | arin |"
dig 4.8.8.origin.asn.cymru.com TXT +short
"15169 | 8.8.4.0/24 | US | arin |"
dig 4.4.8.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.6.8.4.0.6.8.4.1.0.0.2.origin6.asn.cymru.com TXT +short
"15169 | 2001:4860::/32 | US | arin | 2005-03-14"
Getting information about a given ASN:
dig AS15169.asn.cymru.com TXT +short
"15169 | US | arin | 2000-03-30 | GOOGLE - Google Inc.,US"
fun
dig any google-public-dns-a.google.com +noall +answer
; <<>> DiG 9.8.3-P1 <<>> any google-public-dns-a.google.com +noall +answer ;; global options: +cmd google-public-dns-a.google.com. 38271 IN TXT "http://xkcd.com/1361/" google-public-dns-a.google.com. 38271 IN AAAA 2001:4860:4860::8888 google-public-dns-a.google.com. 38271 IN A 8.8.8.8
more stuff at http://www.cambus.net/interesting-dns-hacks/