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:
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 FREEBSD
enc
ENC(4) BSD Kernel Interfaces Manual ENC(4)NAME
enc -- Encapsulating Interface
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device enc
DESCRIPTION
The enc interface is a software loopback mechanism that allows hosts or firewalls to filter ipsec(4) traffic using any firewall package that
hooks in via the pfil(9) framework.
The enc interface allows an administrator to see incoming and outgoing packets before and after they will be or have been processed by
ipsec(4) via tcpdump(1).
The ``enc0'' interface inherits all IPsec traffic. Thus all IPsec traffic can be filtered based on ``enc0'', and all IPsec traffic could be
seen by invoking tcpdump(1) on the ``enc0'' interface.
What can be seen with tcpdump(1) and what will be passed on to the firewalls via the pfil(9) framework can be independently controlled using
the following sysctl(8) variables:
Name Defaults Suggested
net.enc.out.ipsec_bpf_mask 0x00000003 0x00000001
net.enc.out.ipsec_filter_mask 0x00000001 0x00000001
net.enc.in.ipsec_bpf_mask 0x00000001 0x00000002
net.enc.in.ipsec_filter_mask 0x00000001 0x00000002
For the incoming path a value of 0x1 means ``before stripping off the outer header'' and 0x2 means ``after stripping off the outer header''.
For the outgoing path 0x1 means ``with only the inner header'' and 0x2 means ``with outer and inner headers''.
incoming path |------|
---- IPsec processing ---- (before) ---- (after) ----> | |
| Host |
<--- IPsec processing ---- (after) ----- (before) ---- | |
outgoing path |------|
Most people will want to run with the suggested defaults for ipsec_filter_mask and rely on the security policy database for the outer head-
ers.
EXAMPLES
To see the packets the processed via ipsec(4), adjust the sysctl(8) variables according to your need and run:
tcpdump -i enc0
SEE ALSO tcpdump(1), bpf(4), ipf(4), ipfw(4), ipsec(4), pf(4), tcpdump(8)BSD November 28, 2007 BSD