Re: ICMP issues for standard ping?

[jérémie banier <jbanier () gmail com>]

that doesn’t look like nmap output, on my box it looks like this:
Initiating Ping Scan at 21:35
Scanning 192.168.1.1 [1 port]
Completed Ping Scan at 21:35, 0.11s elapsed (1 total hosts)
Nmap scan report for 192.168.1.1
Host is up, received echo-reply ttl 64 (0.0048s latency).
MAC Address: 9C:97:26:B8:B6:66 (Technicolor)
Read data files from: /usr/local/bin/../share/nmap
Nmap done: 1 IP address (1 host up) scanned in 0.32 seconds
           Raw packets sent: 1 (28B) | Rcvd: 1 (28B)

If the output is made using tcpdump filtering on icmp, the 3rd icmp port unreachable could be the result of another 
application sending udp traffic to your TiVO.

http://www.networksorcery.com/enp/protocol/icmp/msg3.htm <http://www.networksorcery.com/enp/protocol/icmp/msg3.htm>

Hope it helps,
Jere


> Le 23 févr. 2016 à 21:32, Mike . <dmciscobgp () hotmail com> a écrit :
>
> i typed this all out before. either no one cared or it got lost in the shuffle. gonna send again because i am still 
> bewildered. ok--setup is simple. 1 laptop, win7, one home cisco router all connected ethernet. no firewall running 
> and no filtering i did on the cisco. when i go to a prompt and do a simple ping echo type 8 i get this for the 
> traffic. me sending, me receiving: (pinging my TIVO box: 192.168.0.10)
>
> IP (tos 0x0, ttl 128, id 26085, offset 0, flags [none], proto: ICMP (1), length:
>  60) 192.168.0.16 > 192.168.0.10: ICMP echo request, id 1, seq 358, length 40
>
> IP (tos 0x0, ttl  64, id 65278, offset 0, flags [none], proto: ICMP (1), length:
>  60) 192.168.0.10 > 192.168.0.16: ICMP echo reply, id 1, seq 358, length 40
>
> same thing with NMAP now. and not the same results. my question is WHY? why am i sending that port unreachable using 
> NMAP? and is this an NMAP thing or mine is the question. thank you
>
> command used: nmap -sn -PE -vv -n 192.168.0.10 -disable-arp-ping
>
> IP (tos 0x0, ttl  40, id 62683, offset 0, flags [none], proto: ICMP (1), length:
>  28) 192.168.0.16 > 192.168.0.10: ICMP echo request, id 19712, seq 0, length 8
>
> IP (tos 0x0, ttl  64, id 65282, offset 0, flags [none], proto: ICMP (1), length:
>  28) 192.168.0.10 > 192.168.0.16: ICMP echo reply, id 19712, seq 0, length 8
>
> IP (tos 0x0, ttl 128, id 26454, offset 0, flags [none], proto: ICMP (1), length:
>  56) 192.168.0.16 > 192.168.0.10: ICMP 192.168.0.16 protocol 1 unreachable, leng
> th 36
>
> (is the sequence supposed to be 0?)
>
>
> Mike
>
>
>
>
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>
>
>
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