0
votes
1answer
21 views

What does this hex value mean in source column within NETMON?

I am using NETMON to try and figure out why my local network is running so slow. I think it may be related to a system logged into it, but in order to not draw attention to my task i have been ...
0
votes
0answers
29 views

udp client sending ICMP “port unreachable” when receiveing messages from the server

(Note: I moved this question from StackOverflow, because it's to be considered off-topic there, better fits here, and still unsolved) I have a udp client using luasocket, basically doing this (with a ...
1
vote
1answer
32 views

SSH and PWNAT for SSH Connection Between Two Separate NATs

Is it possible to use pwnat and SSH to establish a "peer-to-peer" SSH connection between two machines that are behind two separate firewalls/NATs? If this is possible, what are the steps that would ...
0
votes
0answers
25 views

No response to ping of specific size

ping <anything> -s 473 does not receive a single reply. ping <anything> -s 476 works, as well as ping <anything> -s 472 but no size inbetween. What could be the reasons for ...
0
votes
1answer
53 views

Router keep advertising itself on ipv6

I keep receiving the following router advertisement every few seconds from my router on ipv6 despite disabling my wireless ipv6 connection: # tcpdump -vv 'ip6 and icmp6' tcpdump: listening on wlth0, ...
0
votes
0answers
23 views

Why does Windows use the same identifier for different ping sessions?

I noticed while debugging some NATing issues at work that Windows (Windows 7 in this case) echo reply and echo responses are always setting the ICMP identifier field to the same value regardless of ...
0
votes
0answers
103 views

Wireshark Capture Filter

I am new to wireshark and I am trying to capture an ICMP packet over 802.11g, I am using windows and pingplotter. The issue is that on wireshark capture I am not getting any ICMP packets no matter how ...
3
votes
1answer
2k views

How do I forward traffic between Tun device and eth0?

In summary, I would like to have Tun device traffic forwarded back and forth through another network interface that has internet connection. While I can see the traffic going out to internet ...
0
votes
2answers
2k views

what is type of ICMP packets? TCP or UDP

ping packets is a type of ICMP packets.Is there any relation between ICMP with TCP.In other can we guaranty their arrival in the network I want to know ICMP packets in the network is tcp or udp or ...
1
vote
1answer
71 views

How to inspect DSL router? [closed]

There is a DSL connection and a DSL router (Speedport W 701V). After some days or weeks (I didn't record the events) the router makes some problems. Internet connection is ... broken but not ...
1
vote
1answer
166 views

ICMP firewall policy for standard ubuntu desktop

For a standard desktop computer running Ubuntu 12.04 behind a NAT router, what ICMP packets should one accept in the firewall, say iptables? It seems there is often conflicting advice; some say block ...
2
votes
1answer
99 views

traceroute on Linux displays '* * *'

What is going on? If I run traceroute google.com it outputs 192.168.0.1 for the first router (which is correct) and threee *'s for the rest. I have tried disabling the FireWall on the router ...
2
votes
2answers
205 views

Traceroute to IP address fails, but traceroute to domain name with same IP address is okay. Why?

When I traceroute to this IP (108.162.198.181) it stops after 1 hop. But tracerouting to a domain (www.gomodule.com) with the same IP shows 9 hops ending in that target. traceroute to ...
3
votes
1answer
13k views

What could be causing problems on pinging Windows 8 machines?

Here at my job I have 5 machines with Windows 8 Consumer Preview installed on it. Today I was testing the network conectivity and any of the 5 machines answered to a ICMP ping request(but from another ...
1
vote
1answer
812 views

Difference between TCP and IP tunnelling?

Can someone please explain in terms of the OSI (or TCP/IP) layers, what is the difference with what goes on when you tunnel IP or TCP, say over the ICMP protocol (although the latter doesnt really ...
0
votes
3answers
209 views

How to use ICMP to verify the accessibility of a site?

If I want to know for sure that a web site is really blocked by the authorities or the site itself faking it, what kind of a method can I use..? I mean that when we use tracer it just use the ICMP... ...
8
votes
2answers
3k views

What is ICMP broadcast good for?

To configure Linux to ignore ICMP broadcasts (to protect from SMURF attacks), I have added the following line to /etc/sysctl.conf: net.ipv4.icmp_echo_ignore_broadcasts = 1 Anyone knows what are the ...