10-25-2011
i can't get IHL, etc until now
i can't get Version,IHL,TOS, etc until now using tcpdump. Anybody know how to get Version, IHL, TOS, etc using tcpdump just like what showed up in unix[dot]com/programming/117551-calculate-ip-header-checksum-manually.html
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I have a file with some values in a tab delimted format
Eg:
'test' contains:
a<tab>b<tab>c<tab>Trk_12345678
now i need to capture this value 'Trk_12345678' into a variable say 'x' and append that value of 12345678 to 12345679 and store is back to a new 'test1' file as :
'test1'... (11 Replies)
Discussion started by: shiroh_1982
11 Replies
2. Shell Programming and Scripting
Hi guys,
I need a way to capture the host on the next-to-last hop in a traceroute output.
The last output is the destination but I need to capture the router just before the last hop.
I can do this in perl but I'm not so sure about Shell...
I'm on AIX 5.3 using ksh
any ideas?
... (3 Replies)
Discussion started by: TivoliGUY
3 Replies
3. UNIX for Dummies Questions & Answers
I'm new to UNIX. We are using SunOS5.9. In order to maintain the control session active during large file tranfers in ftp, i like to send keep alive packets for every 10 seconds.I like to know the steps to be done to achieve this.
Please help me guys.Thanks in advance. (0 Replies)
Discussion started by: rpr
0 Replies
4. Programming
Hi,
i am using a linux CentOS machine. I have 2 real network interfaces
eth0, eth1 and 2 virtual interfaces tap0 and tap1. I am using PCAP library to capture
the packets on theses interfaces. If i specify the interface as "any",
i cannot find a way to know from which interface the packet... (1 Reply)
Discussion started by: rahulnitk2004
1 Replies
5. Shell Programming and Scripting
Hi everyone!
Can any one help me out regarding capturing relevant data from a file.
For e.g, if i want to capture the comment written after "Prompt:" for a particular date, like for this case what would be the command to capture the tag written after "Prompt:" for Date: 2009-03-20.
A... (7 Replies)
Discussion started by: muhmsida
7 Replies
6. Shell Programming and Scripting
Hii, Friends,
I want your help in one of my problem.
My problem is as follows.
I have a flat file as follows (Just a sample)
MHT011
01(DOT)8750707asdfas8609
03(DOT)ASD3453ASD
09(DOT)876JHT87
11(DOT)sfd324ert
TTT077
01(MOB)876786klj897
06(MOB)876JHT87
07(MOB)sfd324ert... (4 Replies)
Discussion started by: anushree.a
4 Replies
7. Red Hat
I have installed nethogs to see which process is sending load on the network. i would like to know how can i capture its data in a log file. Or is there is a unix command like script or tee which can help me to capture the data using cronjob (0 Replies)
Discussion started by: anshus1
0 Replies
8. Shell Programming and Scripting
Hi,
This is a vcd file.A vcd file may have 'n' modules.
1) I need to capture the data in bold,i.e. the module names (shown in bold)
2) Also i need to capture the data inside each individual module,say for tst_bench_top ,i need to capture data from line 4 to line 20 ...
I just want one... (2 Replies)
Discussion started by: veerabahu
2 Replies
9. Shell Programming and Scripting
Hi folks,
I am working on assignment that captures all the records(2 columns one column contains names and other contain date of birth) from excel sheet stored in a directory and checks for current date and month.
If it matches current date and month then the matched records are printed as... (1 Reply)
Discussion started by: giridhar276
1 Replies
10. AIX
(5 Replies)
Discussion started by: Vishal_dba
5 Replies
LEARN ABOUT FREEBSD
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
snoop(1m), tcpdump(8), etherfind(8c), ipftest(1), ipresend(1), iptest(1), bpf(4), dlpi(7p)
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)