[Samba] getent not working after installing firewall

[Rowland Penny]

On Tue, 5 Mar 2019 08:39:23 +0100
Peter Milesson via samba <samba at lists.samba.org> wrote:

> 
> 
> On 05.03.2019 7:14, Mark Foley via samba wrote:
> > On Tue, 5 Mar 2019 06:17:59 +0100 Reindl Harald
> > <h.reindl at thelounge.net> wrote:
> >> Am 05.03.19 um 00:22 schrieb Mark Foley via samba:
> >>> /etc/resolv.conf:
> >>> nameserver 192.168.0.2
> >>> nameserver 209.18.47.62
> >>>
> >>> /etc/hosts:
> >>> 127.0.0.1               localhost
> >>> 192.168.0.60            ccarter
> >>>
> >>> So, the gateway is the Sonicwall firewall, 192.168.0.1.
> >>> Nameservers are the DC (192.168.0.2) and one of the ISP name
> >>> servers. The IP is static and is set in /etc/hosts. At this
> >>> point, there should be no issues or questions with respect to
> >>> which gateway or DHCP usage (DHCP is not being used)
> >> besides that oyu really could strip your quotes why in the world
> >> are you doing that? there is no point except asking for troubles
> >> when you mix your DC and a external nameserver
> > Personally, I like the quotes. It gives me, and hopefully other, a
> > clearer picture of the problem and what has been tried. A reader
> > can always skip to the bottom.
> >
> > ANYWAY, Standby! I may have the problem solved. I need to do a bit
> > more experimentation with a couple of components, but I think it
> > might be fixed. I'll post again later when I've confirmed.
> >
> > --Mark
> >
> Hi folks,
> 
> I'll poke a stick into this, due to recent experiences.
> 
> Essentially, it's not a Samba problem. It's a network problem. First, 
> make sure your devices and configurations are in order. Then it may,
> or may not work anyway.
> 
> For different reasons, I had to make a slight network topology
> change. I removed the previous gateway/router, and is now using a
> Cisco ASA as firewall/router. The Cisco people are very explicit in
> stating that the ASA is a firewall, not a router. It's possible to
> configure and use it as a router anyway (though you need a PhD in
> Cisco ASA configuration). The Cisco ASA was given the previous
> gateway IP.
> 
> Behind the firewall router are 7 different subnets/VLANs. In the main 
> LAN are a bunch of Windows servers in a AD domain. One of the VLANs 
> contains a Samba ADDC, a Samba fileserver, and Windows clients. The 
> Samba domain machines may connect to the Windows domain, but not the 
> other way around. The Windows VLAN, and the Samba VLAN have got
> internet access. The main DNS servers are in the Windows AD DC, and
> the backup Windows AD DC. There is one single time source for the
> main LAN and VLANs.
> 
> After making the changes, I made a very thorough check that
> everything is working. After 4 days I get a call, that 2 clients in
> the Samba domain cannot contact the mail server, which is in the
> Windows domain. Also, those 2 clients cannot connect to a specific
> printer in the Windows domain. Also, the printer seems to be
> jibbering, transmitting garbage about 10 times/sec. All other clients
> in the Samba domain can connect to the mail server without any
> problems. Testing, retesting, checking firewall rules, checking DNS
> responses, restarting computers, again, again, again. Everything is
> OK. But still it does not work.
> 
> Comes after hours, then I make a complete, total reset of all network 
> devices, all servers, and turning off client computers. It's a small 
> network, so it was manageable during a long evening. After that, 
> everything working flawlessly. Even the printer stopped jibbering.
> 
> My only conclusion here is that something very stale was still cached 
> somewhere. I'm exclusively using HP equipment for switching, so
> there's no no-name, undocumented cheapo stuff in the network. But
> nobody is perfect...
> 
> Hope that my experiences can give you some input and help.
> 
> Best regards,
> 
> Peter
> 
> 

This is just my opinion:

From what I have seen, these expensive firewall type boxes are not
worth the money. Problems are regularly posted on here, that turn out
to be the 'firewall boxes' fault.
If you are installing something at the gateway of your LAN, it better
be a router as well or you are just asking for trouble.

There are numerous open source firewalls available (pfsense,
smoothwall, etc), so why pay through the nose for one ?

Rowland