I installed OpenWRT on a WRT54G-TM (linux 2.4). No problem so far!. I also installed tcpdump on the box.
I set the adapter in monitor mode.
It created the prism0 interface. Tcpdumpíng is also possible using this interface.
Now, the small problem I got is that this won't sniff regular ARP, UDP or TCP packets. I sent udp packets over the air from a laptop and sniffed on both the wl0 and prism0 interface. Tcpdumping on wl0 showed the packets, but it didn't on prism0.
Is the problem related to the lack of a IPV4 address of the prism0 interface?
In one of the Unix Programming FAQ's they have the following headers in the program to catch SIGCHLD
#include <sys/types.h> /* include this before any other sys headers */
#include <sys/wait.h> /* header for waitpid() and various macros */
#include <signal.h> /* header for signal... (5 Replies)
Hi, I got the following question regarding tcpdump and I would appreciate your help/feedback:
--Scenario
I am instructed to capture the network traffic by getting the tcpdump data/files of our network for every hour.
--Problem
Some of the connections are still open when the capture is done... (1 Reply)
Hi,
I'm trying to strip all lines between two headers in a file:
### BEGIN ###
Text to remove, contains all kinds of characters
...
Antispyware-Downloadserver.com (Germany)=http://www.antispyware-downloadserver.c
om/updates/
Antispyware-Downloadserver.com #2... (3 Replies)
Hi ,
I have a typical situation. I have 4 files and with different headers (number of headers is varible ).
I need to make such a merged file which will have headers combined from all files (comman coluns should appear once only).
For example -
File 1
H1|H2|H3|H4
11|12|13|14
21|22|23|23... (1 Reply)
Please look at the third line that the windows size is 257, but in the fourth line it sends 992 bytes. Can anyone tell me why?
Thanks in advance!!!
http://life.chinaunix.net/bbsfile/month_1108/1108241440ce458925d2bb6d73.png (3 Replies)
Hi.
Need Help with TcpDump
Trying to sniff associatio-request with tcpdump but when i run this tcpdump -i eth0 wlan subtype assoc-req i get this error
can anyone help me with this error ? Thanks alot !!:) (1 Reply)
I've recently started learning to use TCPdump, and I find it pretty interesting. There's one thing I don't understand. When I tell it to capture packets on, say, the WiFi interface en1, it often captures packets sent or received by other hosts on the network. How can it do this? My... (3 Replies)
Hello
I googled for "tcpdump view HOST http headers" -- that fine
However can we do same for HTTPS like after the HTTPS gets decrypted by Apache ?
I think this is legitimate on the server where the site is hosted since at some point the Apache itself needs to get the HOST patrameter in... (1 Reply)
Discussion started by: coolatt
1 Replies
LEARN ABOUT NETBSD
ipresend
IPRESEND(1) General Commands Manual IPRESEND(1)NAME
ipresend - resend IP packets out to network
SYNOPSIS
ipresend [ -EHPRSTX ] [ -d <device> ] [ -g <gateway> ] [ -m <MTU> ] [ -r <filename> ]
DESCRIPTION
ipresend was designed to allow packets to be resent, once captured, back out onto the network for use in testing. ipresend supports a num-
ber of different file formats as input, including saved snoop/tcpdump binary data.
OPTIONS -d <interface>
Set the interface name to be the name supplied. This is useful with the -P, -S, -T and -E options, where it is not otherwise possi-
ble to associate a packet with an interface. Normal "text packets" can override this setting.
-g <gateway>
Specify the hostname of the gateway through which to route packets. This is required whenever the destination host isn't directly
attached to the same network as the host from which you're sending.
-m <MTU>
Specify the MTU to be used when sending out packets. This option allows you to set a fake MTU, allowing the simulation of network
interfaces with small MTU's without setting them so.
-r <filename>
Specify the filename from which to take input. Default is stdin.
-E The input file is to be text output from etherfind. The text formats which are currently supported are those which result from the
following etherfind option combinations:
etherfind -n
etherfind -n -t
-H The input file is to be hex digits, representing the binary makeup of the packet. No length correction is made, if an incorrect
length is put in the IP header.
-P The input file specified by -i is a binary file produced using libpcap (i.e., tcpdump version 3). Packets are read from this file
as being input (for rule purposes).
-R When sending packets out, send them out "raw" (the way they came in). The only real significance here is that it will expect the
link layer (i.e. ethernet) headers to be prepended to the IP packet being output.
-S The input file is to be in "snoop" format (see RFC 1761). Packets are read from this file and used as input from any interface.
This is perhaps the most useful input type, currently.
-T The input file is to be text output from tcpdump. The text formats which are currently supported are those which result from the
following tcpdump option combinations:
tcpdump -n
tcpdump -nq
tcpdump -nqt
tcpdump -nqtt
tcpdump -nqte
-X The input file is composed of text descriptions of IP packets.
SEE ALSO ipftest(1), ipsend(1), iptest(1), bpf(4), ipsend(5), tcpdump(8)DIAGNOSTICS
Needs to be run as root.
BUGS
Not all of the input formats are sufficiently capable of introducing a wide enough variety of packets for them to be all useful in testing.
If you find any, please send email to me at darrenr@pobox.com
IPRESEND(1)