I was wondering how one could set up tcpdump to run in the background, dumping all output to a file until I terminate the process.Here is the dilema... I SSH into the box that will be listening (using tcpdump)...
ssh> sudo tcpdump -i eth0 > dump_file
yadda yadda...
then if I exit my ssh session, tcpdump closes.
If I do a...
ssh> sudo tcpdump -i eth0 > dump_file &
[1] 12938
yadda yadda.
When attempting to run a tcdump in the background (IPSO) with the following command:
I get the message:
However the command runs fine without the '&' at the end of the line are there syntax restrictions in using the '&' flag?
I have ssh open to one of my servers on a non-standard port. I have never seen anything to make me believe someone has cracked or even has tried to crack into the machine in the past. However, I was troubleshooting another issues I had and notice entries like this in my tcpdump output:
13:09:22.341390 IP 192.168.1.2.51413 > 190-82-164-231.adsl.tie.cl.10399: UDP, length 67
13:09:22.341427 IP 192.168.1.2.51413 > 95.58.5.15.22439: UDP, length 67
13:09:22.341464 IP 192.168.1.2.51413 > ool-4350a8e7.dyn.optonline.net.56836: UDP, length 67
13:09:22.341499 IP 192.168.1.2.51413 > 80.237.121.2.63878: UDP, length 67
13:09:22.396750 IP ool-4350a8e7.dyn.optonline.net.56836 > 192.168.1.2.51413: UDP, length 58
13:09:22.698354 IP 95.58.5.15.22439 > 192.168.1.2.51413: UDP, length 58
Obviously some of these are IP addresses of people on ISPs. Are these people just scanning ports? I do not see any invalid users in my secure log so I am not too concerned right now. But I am getting a ton of these (above entries) in my tcpdumps, so it is a little scary to think that there is this many people trying to scan my ports and possible attacking me. I am just trying to learn more about security and tcp packets.
I'm not an iptables expert. Anybody know how to create a rule/chain that will log info similar to what tcpdump -s0 would do?
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Code:
for (( ; ; ))
do
if ping -b -c 1 chatify.net
then
[Code].....
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right?
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test.ksh:
.....
.....
xxx/xxx.ksh <--- program/script called by the script
sleep 300
..... run the rest of the script .....
..... problem is sometimes xxx/xxx.ksh takes longer than 300 seconds .....
..... any way that I can monitor that xxx/xxx.ksh finishes before I run .....
..... the rest of the scripts .....
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[Code]...
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