How to mix host access with security=domain

[Mohamed LRHAZI]

Hello all,

I am happily using samba to give access to all our NT domain users to
shares
of a cpl of Solaris servers... security=domain and users mapping...

Now I have several PCs connecting from far away, and who are not memeber
of the NT domain,
and most probably memeber of no domian at all...

My first question is:  can I tell samba to keep working with
security=domain, plus non-domain for
some IP@

My second question :
When this far away PCs try a search of the samba server by its IP@, that
it can ping correctly btw, I only
see this packets exchange :

  1   0.00000 PC-NY -> SAMBA_PARIS       TCP D=445 S=2096 Syn
Seq=3574114032 Len=0 Win=16384 Options=<mss 1460,nop,nop,sackOK>
  2   0.00003 SAMBA_PARIS -> PC-NY 	 TCP D=2096 S=445 Rst Ack=3574114033
Win=0 
  3   0.63593 PC-NY -> SAMBA_PARIS       TCP D=445 S=2096 Syn
Seq=3574114032 Len=0 Win=16384 Options=<mss 1460,nop,nop,sackOK>
  4   0.00003 SAMBA_PARIS -> PC-NY 	 TCP D=2096 S=445 Rst Ack=3574114033
Win=0


Does this look ok to you, samba gurus? 
Or do I have other problems here, like filtered away traffic?

Thanx alot...


Mohamed~