02-27-2020
Ethernet, in the "old days", used to use a protocol called Carrier-sense multiple access with collision detection (CSMA/CD):
Either way, if you have many devices "talking" on the same LAN segment, it is normal for a packet to be delayed.
As vbe has mentioned (above), without the full details of your network topography and hosts; there is no way to answer your question accurately.
If you still need help, please post all the details so the experts here do not have to guess what you are doing.
Thanks.
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PG3(8) System Manager's Manual: iputils PG3(8)
NAME
pg3, ipg, pgset - send stream of UDP packets
SYNOPSIS
source ipg
pg
pgset COMMAND
DESCRIPTION
ipg is not a program, it is script which should be sourced to bash. When sourced it loads module pg3 and exports a few of functions acces-
sible from parent shell. These macros are pg to start packet injection and to get the results of run; and pgset to setup packet generator.
pgset can send the following commands to module pg3:
COMMAND
odev DEVICE
Name of Ethernet device to test. See warning below.
pkt_size BYTES
Size of packet to generate. The size includes all the headers: UDP, IP, MAC, but does not account for overhead internal to medium,
i.e. FCS and various paddings.
frags NUMBER
Each packet will contain NUMBER of fragments. Maximal amount for linux-2.4 is 6. Far not all the devices support fragmented buf-
fers.
count NUMBER
Send stream of NUMBER of packets and stop after this.
ipg TIME
Introduce artificial delay between packets of TIME microseconds.
dst IP_ADDRESS
Select IP destination where the stream is sent to. Beware, never set this address at random. pg3 is not a toy, it creates really
tough stream. Default value is 0.0.0.0.
dst MAC_ADDRESS
Select MAC destination where the stream is sent to. Default value is 00:00:00:00:00:00 in hope that this will not be received by
any node on LAN.
stop Abort packet injection.
WARNING
When output device is set to some random device different of hardware Ethernet device, pg3 will crash kernel.
Do not use it on VLAN, ethertap, VTUN and other devices, which emulate Ethernet not being real Ethernet in fact.
AUTHOR
pg3 was written by Robert Olsson <robert.olsson@its.uu.se>.
SECURITY
This can be used only by superuser.
This tool creates floods of packets which is unlikely to be handled even by high-end machines. For example, it saturates gigabit link with
60 byte packets when used with Intel's e1000. In face of such stream switches, routers and end hosts may deadlock, crash, explode. Use
only in test lab environment.
AVAILABILITY
pg3 is part of iputils package and the latest versions are available in source form for anonymous ftp ftp://ftp.inr.ac.ru/ip-rout-
ing/iputils-current.tar.gz.
iputils-021109 09 iINAON 2002 PG3(8)