Packets dropped by kernel without firewall rules

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


Hi all,
I'm analizing some behavior of my FC2 installation.

This is what appens:
ping an address I obtain response from the host.

When I run nmap on this host I obtain the result:
Starting nmap 3.50 ( ) at 2004-07-08 16:20
Note: Host seems down. If it is really up, but blocking our ping probes,
try -P0
Nmap run completed -- 1 IP address (0 hosts up) scanned in 12.126

This is very strange because I'm able to ping the host and is directly

If I open another shell and run the tcpdump command the nmap works well

Starting nmap 3.50 ( ) at 2004-07-08 16:23
Interesting ports on
(The 1654 ports scanned but not shown below are in state: closed)
66/tcp   open  sql*net
135/tcp  open  msrpc
139/tcp  open  netbios-ssn
445/tcp  open  microsoft-ds
8081/tcp open  blackice-icecap

Nmap run completed -- 1 IP address (1 host up) scanned in 3.021 seconds

At the end of the tcpdump sometime I obtain a lot of packets dropped by
kernel, but I don't have iptables rules activated.
Why my kernel drop some packets?
And whi nmap don't work well?

Someone know the answer?
Thanks in advance to all

[Index of Archives]     [Current Fedora Users]     [Fedora Desktop]     [Fedora SELinux]     [Yosemite News]     [Yosemite Photos]     [KDE Users]     [Fedora Tools]     [Fedora Docs]

  Powered by Linux