Daniel Hartmeier wrote: > On Tue, Jul 26, 2005 at 05:58:18AM -0700, Pejman Moghadam wrote: > > I have one FreeBSD 5.4 router/firewall box in my LAN that do NAT > > with PF. > > The problem is I can't ping the same machine on the internet from > > two or more different machines on my LAN at the same time. only one > > of my LAN clients can ping that target, and pinging that target > > from another station is possible only when i stop pinging from > > first client. > > Is there any way or any tool that ICMP portmapping allows > > simultaneous connections to external targets from multiple machines > > from the LAN? > > I don't believe you have actually tried this. > > From one workstation (10.1.1.20) > > $ ping 199.185.137.3 > 64 bytes from 199.185.137.3: icmp_seq=0 ttl=235 time=218.693 ms > 64 bytes from 199.185.137.3: icmp_seq=1 ttl=235 time=211.615 ms > [...] > > At the same time, from another workstation (10.2.2.11) > > $ ping 199.185.137.3 > 64 bytes from 199.185.137.3: icmp_seq=0 ttl=235 time=195.604 ms > 64 bytes from 199.185.137.3: icmp_seq=1 ttl=235 time=194.387 ms > > On the gateway which does NAT for both > > # pfctl -ss | grep icmp > kue0 icmp 10.1.1.20:354 -> 62.65.145.30:354 -> 199.185.137.3:354 0:0 > kue0 icmp 10.2.2.11:19057 -> 62.65.145.30:19057 -> > 199.185.137.3:19057 0:0 > > What looks like port numbers in the state is the ICMP ID, a number > chosen randomly for one ping invokation. pf uses this to dispatch > incoming replies from the external host to the appropriate internal > host.
FWIW, while I haven't looked into this in detail, it appears Windows clients always use the same ICMP ID--512... >echo %os% Windows_NT >ping 199.185.137.3 Pinging 199.185.137.3 with 32 bytes of data: Reply from 199.185.137.3: bytes=32 time=117ms TTL=242 Reply from 199.185.137.3: bytes=32 time=118ms TTL=242 Reply from 199.185.137.3: bytes=32 time=118ms TTL=242 Reply from 199.185.137.3: bytes=32 time=118ms TTL=242 # uname -a OpenBSD openbsdvm.internal.melameth.com 3.7 GENERIC#50 i386 # ping -c 5 199.185.137.3 PING 199.185.137.3 (199.185.137.3): 56 data bytes 64 bytes from 199.185.137.3: icmp_seq=0 ttl=242 time=129.318 ms 64 bytes from 199.185.137.3: icmp_seq=1 ttl=242 time=128.110 ms 64 bytes from 199.185.137.3: icmp_seq=2 ttl=242 time=100.227 ms 64 bytes from 199.185.137.3: icmp_seq=3 ttl=242 time=159.927 ms 64 bytes from 199.185.137.3: icmp_seq=4 ttl=242 time=153.973 ms --- 199.185.137.3 ping statistics --- 5 packets transmitted, 5 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 100.227/134.311/159.927/21.297 ms # uname -a OpenBSD mel.internal.melameth.com 3.7 GENERIC#50 i386 # ping -c 5 199.185.137.3 PING 199.185.137.3 (199.185.137.3): 56 data bytes 64 bytes from 199.185.137.3: icmp_seq=0 ttl=242 time=117.295 ms 64 bytes from 199.185.137.3: icmp_seq=1 ttl=242 time=124.281 ms 64 bytes from 199.185.137.3: icmp_seq=2 ttl=242 time=115.875 ms 64 bytes from 199.185.137.3: icmp_seq=3 ttl=242 time=119.523 ms 64 bytes from 199.185.137.3: icmp_seq=4 ttl=242 time=123.472 ms --- 199.185.137.3 ping statistics --- 5 packets transmitted, 5 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 115.875/120.089/124.281/3.320 ms ...and the output from the gateway which reflects the machines above respectively: $ sudo pfctl -ss | grep icmp self icmp 192.168.x.x:512 -> 207.224.x.x:512 -> 199.185.137.3:512 0:0 self icmp 192.168.x.x:51726 -> 207.224.x.x:51726 -> 199.185.137.3:51726 0:0 self icmp 192.168.x.x:5903 -> 207.224.x.x:5903 -> 199.185.137.3:5903 0:0 _______________________________________________ freebsd-pf@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-pf To unsubscribe, send any mail to "[EMAIL PROTECTED]"
