There's an issue I've seen with freebsd and icmp pings.  FreeBSD (well
4.9 at least) doesn't do a very good job NATting multiple hosts pinging
the same address.  It may be that this same issue arises when the
machine doing the natting pings a host that a machine behind it is also
pinging.  See here for more details on what I've seen:

http://m0n0.ch/wall/list/?action=show_msg&actionargs[]=73&actionargs[]=12

-bmd

On Tue, 2004-08-17 at 14:27, Joe Lagreca wrote:
> I am continuously pinging an IP address about 3 hops away from me from
> my internally NAT'ed PC.  When I try to ping that same address from
> the m0n0wall ping page, it returns nothing.  That is, until I stop
> pinging from my internal machine.  Then when I ping from m0n0 it goes
> just fine.  Is this normal behavior (some weird NAT characteristic)?
> 
> By the way, my stupid mistake from earlier didn't fully clear up all
> of the problems I have been having.  I'm still trying to determine if
> it is a local configuration problem or an ISP problem.  My ping times
> are all over the place for hosts only 3 hops away (still on my ISP's
> private network)!
> 
> They claim everything looks good from their end, but then every other
> day they find a problem, fix it, and ask if I'm doing ok now.  I am
> starting to think it may be a config problem on their network
> somewhere.  They just switched backbone providers, and the problem may
> have occured near that time (I'm not possitive on the timing).
> 
> Thanks for your help!
> 
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