1
vote
1answer
643 views

Understand wireshark capture for ssh key exchange

I need to understand SSH key exchange, I have tried to read RFC document but it seems very difficult to understand so I have captured packets using wireshark ,I found various packets for ssh ...
1
vote
1answer
101 views

“tshark: There are no interfaces on which a capture can be done” in Amazon Linux AMI

My goal is to capture packets with tshark in Amazon Linux AMI. While typing tshark in the command line there's an error: "tshark: There are no interfaces on which a capture can be done" How to ...
0
votes
1answer
109 views

How can I measure the cumulative network usage of a process, from execution beginning to end

I want to measure how much bandwidth git pull uses, preferably by prefixing git command with desired program, i.e. nettally git pull Alternatively, is there some sneaky way to accumulate nethogs / ...
1
vote
2answers
886 views

Wireshark does not capture HTTP on 8080

I am running Wireshark on my linux machine and i have simple python web server running on localhost:8080 I am capturing only local port 8080. When i open browser on localhost:8080 wireshark captures ...
0
votes
1answer
340 views

syn flood attack — packet hits on shared ip

How can I dump the TCP packets to get a better idea to know which website is being attacked? Here is what I have in my logs: May 4 23:10:26 host kernel: [2130002.635000] Firewall: *SYNFLOOD ...
1
vote
2answers
925 views

TCPDump and IPTables DROP by string

by using tcpdump -nlASX -s 0 -vvv port 80 I get something like: 14:58:55.121160 IP (tos 0x0, ttl 64, id 49764, offset 0, flags [DF], proto TCP (6), length 1480) 206.72.206.58.http > ...
-2
votes
2answers
566 views

Using tcpdump to find strings [closed]

I need to block certain TCP packets by trying to find a string match in and on them. Is there a way to do that with TCPDump? Or do I need wireshare install on my linux server? One I have the string ...
1
vote
1answer
98 views

centos6 - wireshark

1) Is there any easy way to install wireshark-1.8.3 on centos 6 ? I try the wget utility and i get the dependency on gtk..which inturn has dependency on glib, atk , pango and cairo.. 2) Looks like ...
3
votes
1answer
223 views

How to use a switch as a network tap?

I would like to tcpdump all traffic that my router does when it makes a firmware update. So I have taken a HP ProCurve 1800-8G switch and mirrored port 7 to port 8. I have connected: Internet ...
3
votes
2answers
938 views

How to use Linux to capture packets on eth0 and send everything to eth1?

Today I got an enterprise Internet connection together with a Sagemcom router. The first time it is connected to the Internet, it will spend 20 minutes upgrading the firmware. I would really like to ...
2
votes
2answers
1k views

using wireshark/tshark in command line to ignore ssh connections

I'm trying to debug some by looking at the packets and I would like to avoid getting all the SSH traffic to the server. Is there a way to ignore? I tried to do something like tshark -f "port !22" but ...
5
votes
3answers
9k views

How do I install Wireshark in Red Hat Linux?

How do I install Wireshark in Red Hat Linux? At the Wireshark download page, am I supposed to download "Standard package" for Red Hat under "Third-Party Package"? Does the Red Hat version have a ...
1
vote
1answer
542 views

how to generate the graph in wireshark?

$ sudo tshark -i eth0 -R 'http.request.method == "GET"' "port 80" Running as user "root" and group "root". This could be dangerous. Capturing on eth0 5.641015 10.53.0.66 -> 209.85.143.104 HTTP ...
1
vote
1answer
222 views

PCAP to Syslog utility

I am looking for a tool which sniff all the traffic on an interface and produce a syslog like Cisco log in real time. Example : Feb 16 10:19:05 tcp S.S.S.S(6083) -> D.D.D.D(80), 1 packet Feb 16 ...
0
votes
2answers
326 views

Needs help to understand the wireshark results of a data transferring

In my LAN, I have a router that runs a Samba server and my PC connects to the router. I wiresharked during uploading a file from my PC to the samba server. Below is a shortcut of the wireshark ...
2
votes
2answers
5k views

How to debug “HTTP request sent, awaiting response”?

I have a Linux server on an ADSL connection, and I just noticed that sometimes I get Connecting to example.com|xxx.xxx.xxx.122|:80... connected. HTTP request sent, awaiting response... when I use ...
3
votes
1answer
479 views

SSL Packet inspection on Linux

I'm trying to build a web client for an HTTPS website. I think I've done everything right, yet obviously I get a different result in the browser than with my crawler. As far as I understand, there is ...
3
votes
3answers
528 views

How do I find out what all this traffic is?

I have seen a consistent spike in traffic over my network since Monday morning and I don't know where it's coming from! I don't have netflow routers (like I would like), I have IPCop firewalls. ...
3
votes
2answers
3k views

What program sent which packet to the network [duplicate]

I would like to have a tcpdump like program that shows which program sent a specific packet, instead of just getting the port number. This is a generic problem I've had on and off sometimes when you ...
1
vote
3answers
527 views

Dropped packets in Linux

I'am using a machine as a router, it works sort of fine, however if I do a ping -t whatever.server it will always cause a 3-4% package loss, no matter what server. Looking at ifconfig or netstat -i ...
1
vote
0answers
852 views

TCP Zero Window with no corresponding Window Update

I am trying to debug a network issue and am using Wireshark and tcpdump to grab packets from my server. I have one client application that is grabbing all my available connections and then holding ...
0
votes
2answers
2k views

Track IP Messenger's chatting by wireshark

We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. ...
3
votes
3answers
832 views

Sniff packets which have source address other than my machine

I tried sniffing network traffic between 2 ip addresses. One is a HTTP server and other is the client accessing that site. My aim is to sniff POST method form data. How do i do that? When i tried ...