[smokeping-users] [OT] Using ping with a set ToS value
emanners at realprod.acns.fsu.edu
Wed Mar 26 23:38:21 MET 2003
I currently nee to use ping with certain QoS values. We currently use dscp
values that are multiples of 8. eg. (0,8,16,24,32,40,48,56)
The sprint man page though has a slightly different convention for nameing
these values and I cannot tell if there is some equivalent in there for sure.
Can someone please point me to where I can get more info or explain to m ehow
I can get to ping these different dscp values?
P.S. This was copied from the ping man page.
-Q tos Set Quality of Service -related bits in ICMP datagrams. tos can
be either decimal or hex number. Traditionally (RFC1349), these
have been interpreted as: 0 for reserved (currently being rede
fined as congestion control), 1-4 for Type of Service and 5-7 for
Precendence. Possible settings for Type of Service are: minimal
cost: 0x02, reliability: 0x04, throughput: 0x08, low delay: 0x10.
Multiple TOS bits should not be set simultaneously. Possible
settings for special Precedence range from priority (0x20) to net
control (0xe0). You must be root (CAP_NET_ADMIN capability) to
use Critical or higher precendence value. You cannot set bit
0x01 (reserved) unless ECN has been enabled in the kernel. In
RFC2474, these fields has been redefined as 8-bit Differentiated
Services (DS), consisting of: bits 0-1 of separate data (ECN will
be used, here), and bits 2-7 of Differentiated Services Codepoint
Education's purpose is to replace an empty
mind with an open one. - Unknown
Academic Computing and Network Systems
Florida State University
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