Hi all, new to the forum and rusty with my scripting. I am trying to put together a quick and dirty script that will kickoff a tcpdump on multiple machines. Then, another script that will reach out (at a later time) to stop the processes and retrieve the data. It seems fairly easy conceptually and will most likely consist of repeating lines with different username@<ip addresses> so I am trying to get just one to work for now.
Digging around the interweb has simply confused me and I could really use some help.
The usernames for the machines all have passwords (sorry, using keys is not an option) so I was looking at using expect like:
Code:
#!/usr/bin/expect -f
spawn ssh <username>@<ip_address> "/usr/sbin/tcpdump -i any -w filename.dump &"
expect "assword:"
send "<password>\r"
... then repeat for another server, leaving tcpdump running on each box when I'm done
Obviously, this does not work or I wouldn't be here. In this case, the script runs but when I look on the server, tcpdump is not running. I had tried using "interact" after the password and removing the & but that just left my script hanging and not moving on to kickoff the next tcpdump.
I have two net-card. one is 172.16.24.99(ENG) ,another is 172.16.25.99(ENG-B). Both masks is 255.255.255.0.
I will monitor data on the tcp port 8055 in ENG, How do I set option of tcpdump command (2 Replies)
To clear the web cache on my web server, I run this command:
find $APACHE_HOME/cache/plsql/plsql -type d -name "*" -exec rm -R {} \;
To clear the cache on all the web servers(we have 4), I log on to any one machine, clear its cache, ssh to another machine, clear cache etc;
Is there any way... (8 Replies)
Greetings, I just started using scripting languages,
im trying to get a tcpdump in a file, change the
file name every 5mins ... this is what i have but its
not working ... any suggestions?
#!/bin/bash
# timeout.sh
#timestamp format
TIMESTAMP=`date -u "+%Y%m%dT%H%M%S"`
#tdump =`tcpdump... (3 Replies)
i am trying to write a script to parse some tcpdump output, in each line of the tcpdump output, I know for sure there are 3 keywords exist:
User{different usernamehere}
NAS_ipaddr{different ip here}
Calling_station{ip or dns name here}
But the positions for these 3 keywords in the... (4 Replies)
I'm new to the Unix/Linux world. I have taken classes and played with a few simple scripts but never had a real world application. Here is my problem.
What I need to do is every 15min between 8am and 5pm, run
tcpdump -s 2000 -w flowroute-0000.pcap
where the "0000" is the current time.
... (4 Replies)
Hi all
I have to run certain set of commands on two machines, the two machines see the same home, it's mounted from the same place. The problem is that i have to ssh to a certain machine "which is slow unfortunately" that has the license to run a tool and i want to return to the original machine... (3 Replies)
I want a script that would do as:-
a) gives me packet capture account for each time it runs.
b) be able to run at a particular time for specific period time duration (1 min).
c) for each time it runs it saves the time / day.
Is there a way where i can capture the details as seen in the... (2 Replies)
Hi All, I have been a guest visitor from a long time and this forum is wonderful. I finally am a member of this forum too, so i am here stuck with a shell script that i was trying to write
My requirement is that i should be able to create a shell script which will check if a process is running on... (3 Replies)
Hi Folks ,
I have a query that is I have a server (unix machhine) to which I login thru winscp or putty , mostly I use putty and at a particular location there is one xml(abc.xml) while which I change , let say
1) I login to first unix box
hostname :- ccc74
username ... (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)
Discussion started by: Ultrix
3 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)