07-30-2001
hi, yes I did, but i need that inside a script....this is the problem...and also, if you use a number with a decimal for example 198.7 and 78.5 in a script, how do u use the bc command to use "scale = 3", because in a script you can spesify it as follows :
TOT=` 198.7 / 78.5 | bc`
It will devide the 198 and 78, but throw away the .7 and .5
On command line you can do it :
$bc
scale = 3
198.7 / 78.5
2.531
quit
$
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LEARN ABOUT MOJAVE
tc-csum
Checksum action in tc(8) Linux Checksum action in tc(8)
NAME
csum - checksum update action
SYNOPSIS
tc ... action csum UPDATE
UPDATE := TARGET [ UPDATE ]
TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | sctp | SWEETS }
SWEETS := { and | or | + }
DESCRIPTION
The csum action triggers checksum recalculation of specified packet headers. It is commonly used to fix incorrect checksums after the pedit
action has modified the packet content.
OPTIONS
TARGET Specify which headers to update: IPv4 header (ip4h), ICMP header (icmp), IGMP header (igmp), TCP header (tcp), UDP header (udp),
UDPLite header (udplite) or SCTP header (sctp).
SWEETS These are merely syntactic sugar and ignored internally.
EXAMPLES
The following performs stateless NAT for incoming packets from 192.0.2.100 to new destination 198.51.100.1. Assuming these are UDP packets,
both IP and UDP checksums have to be recalculated:
# tc qdisc add dev eth0 ingress handle ffff:
# tc filter add dev eth0 prio 1 protocol ip parent ffff:
u32 match ip src 192.0.2.100/32 flowid :1
action pedit munge ip dst set 198.51.100.1 pipe
csum ip and udp
SEE ALSO
tc(8), tc-pedit(8)
iproute2 11 Jan 2015 Checksum action in tc(8)