my "ping" report "successful" if remote is a linux, but "unreachable"

[liklstar]

Hi, all:

How can I check what happen with my own NIC driver which response "successful" when local PC "ping" a remote linux PC but "unreachable" when it "ping" a remote windows XP PC? My writed driver runs in linux 3.0.4 kernel.


thanks!
li, kunlun

[scathefire]

can the XP machine ping the Linux machine? are they on the same network? firewall maybe?

[liklstar]

can the XP machine ping the Linux machine? are they on the same network? firewall maybe?

Yes. The XP can ping linux, they are also on the same local network!

[atreyu]

What about nmap ping? e.g.:

nmap -n -sP 192.168.1.4

Have you tried the various protocols that can be used to ping? Here's an example using perl and the Net::Ping module:

#!/usr/bin/perl -w
use strict;
use Net::Ping;
$| = 1;
my $host = shift || die "give me a host or ipaddr\n";
for(qw/tcp udp icmp stream syn/){
  my $p = Net::Ping->new($_);
  print "ping using $_, $host is ";
  print ( ($p->ping($host)) ? "alive\n" : "down\n");
  $p->close();
}

[liklstar]

What about nmap ping? e.g.:

nmap -n -sP 192.168.1.4

Have you tried the various protocols that can be used to ping? Here's an example using perl and the Net::Ping module:

#!/usr/bin/perl -w
use strict;
use Net::Ping;
$| = 1;
my $host = shift || die "give me a host or ipaddr\n";
for(qw/tcp udp icmp stream syn/){
  my $p = Net::Ping->new($_);
  print "ping using $_, $host is ";
  print ( ($p->ping($host)) ? "alive\n" : "down\n");
  $p->close();
}

root@liklstar-server:~# ifconfig eth2 192.168.5.204 netmask 255.255.255.0
root@liklstar-server:~# nmap -n -sP 192.168.5.104

Starting Nmap 5.00 (...) at 2011-11-10 13:08 CST
Host 192.168.5.104 is up (0.00018s latency).
MAC Address: 00:16:41:3E:40:74 (USI)
Nmap done: 1 IP address (1 host up) scanned in 0.36 seconds
root@liklstar-server:~#

Thank you very much!
What do these information mean? Do these mean the 204 can reach 104 as if ping 104 successfully?

li,kunlun

[atreyu]

no, that's not a good test. nmap ping the windows box ip address from your linux box.