248
Appendix Packet precedences
IP precedence and DSCP values
Figure 249
DS field and ToS field
As shown in
, the ToS field of the IP header contains 8 bits: the first 3 bits (0 to 2) represent IP
precedence from 0 to 7. According to RFC 2474, the ToS field of the IP header is redefined as the
differentiated services (DS) field, where a differentiated service code point (DSCP) value is represented
by the first 6 bits (0 to 5) and is in the range 0 to 63. The remaining 2 bits (6 and 7) are reserved.
Table 119
Description on IP precedence
IP precedence (decimal)
IP precedence (binary)
Keyword
0 000
routine
1 001
priority
2 010
immediate
3 011
flash
4 100
flash-override
5 101
critical
6 110
internet
7 111
network
Table 120
Description on DSCP values
DSCP value (decimal)
DSCP value (binary)
Keyword
46 101110
ef
10 001010
af11
12 001100
af12
14 001110
af13
18 010010
af21
20 010100
af22
22 010110
af23
26 011010
af31
28 011100
af32
Содержание MSR SERIES
Страница 17: ...xv Documents 835 Websites 835 Conventions 836 Index 838 ...
Страница 20: ...3 Figure 3 Initial page of the Web interface ...
Страница 42: ...25 Figure 13 Firefox Web browser setting ...
Страница 59: ...42 Figure 27 Checking the basic service configuration ...
Страница 73: ...56 Figure 35 Sample interface statistics ...
Страница 156: ...139 Figure 139 Rebooting the 3G modem ...
Страница 168: ...151 Figure 152 Configuring Web server 2 ...
Страница 174: ...157 Figure 158 Configure the URL filtering function ...
Страница 187: ...170 Upon detecting the Land or Smurf attack on Ethernet 0 2 Router outputs an alarm log and drops the attack packet ...
Страница 242: ...225 Figure 233 Enabling the DHCP client on interface Ethernet 0 1 ...
Страница 247: ...230 Figure 236 The page for configuring an advanced IPv4 ACL ...
Страница 255: ...238 Figure 241 Advanced limit setting ...
Страница 298: ...281 e Click Apply 2 Configure Router B in the same way Router A is configured ...
Страница 354: ...337 Figure 339 Configuring a login control rule so Host B cannot access Router through the Web ...
Страница 400: ...383 Figure 387 Verifying the configuration ...
Страница 405: ...388 ...
Страница 523: ...506 Figure 530 Ping configuration page ...
Страница 538: ...521 a Click Device A on the topology diagram b Click Ethernet 0 2 on the panel diagram c Click Port Guard ...
Страница 744: ...727 Verifying the configuration In the case that the IP network is unavailable calls can be made over PSTN ...
Страница 775: ...758 Figure 785 Configuring a jump node ...
Страница 791: ...774 Figure 801 Configuring a jump node ...