(solved) 2.5 connecting via hostname not working across interfaces

johnpoz · Mar 10, 2021, 6:50 PM

@bob-dig said in [solved] 2.5 connecting via hostname not working across interfaces:

hostname only connecting without a problem

Your either doing discovery - which would be same L2, or your windows clients are adding suffix like they are suppose to..

Sorry but it is not possible to do discovery, be it broadcast, multicast, LLDP, WSD, etc. across vlans.. For dns to respond the query has to be fully qualified.

You running an old school WINS ;)

example... Here I only ask for sg4860, but you see the actual query sent via nslookup is sg4860.local.lan.. Because windows has that as its search suffix.

C:\>nslookup
Default Server:  pi-hole.local.lan
Address:  192.168.3.10

> set querytype=A
> set debug
> sg4860
Server:  pi-hole.local.lan
Address:  192.168.3.10

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        sg4860.local.lan, type = A, class = IN
    ANSWERS:
    ->  sg4860.local.lan
        internet address = 192.168.9.253
        ttl = 3547 (59 mins 7 secs)

------------
Non-authoritative answer:
Name:    sg4860.local.lan
Address:  192.168.9.253

>

C:\>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : I5-Win
   Primary Dns Suffix  . . . . . . . : local.lan
   Node Type . . . . . . . . . . . . : Broadcast
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : local.lan

Bob.Dig · Mar 10, 2021, 6:58 PM

@johnpoz It is still looking different here:

PS C:\WINDOWS\system32> nslookup
Default Server:  pfSense.home.arpa
Address:  192.168.1.1

>  set querytype=A
>  set debug
> mail
Server:  pfSense.home.arpa
Address:  192.168.1.1

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        mail, type = A, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 612 (10 mins 12 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2021031001
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
*** pfSense.home.arpa can't find mail: Non-existent domain

PS C:\WINDOWS\system32> ipconfig -all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : U5
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : home.arpa

Really have no clue why it is working again and not before.

Gertjan · Mar 11, 2021, 7:40 AM

@bob-dig

My turn :
I don't have a local host name called 'mail', but I have one called 'diskstation2' :

C:\Users\Gauche>nslookup
Serveur par dÚfaut :   pfsense.my-domain.net
Address:  2001:470:1f13:5c0:2::1

> set querytype=A
> set debug
> diskstation2
Serveur :   pfsense.my-domain.net
Address:  2001:470:1f13:5c0:2::1

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  response, auth. answer, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        diskstation2.my-domain, type = A, class = IN
    ANSWERS:
    ->  diskstation2.my-domain.net
        internet address = 192.168.1.33
        ttl = 3600 (1 hour)

------------
Nom :    diskstation2.my-domain.net
Address:  192.168.1.33

>

C:\Users\Gauche>ipconfig -all

Configuration IP de Windows

   Nom de l’hôte . . . . . . . . . . : Gauche2
......
   Liste de recherche du suffixe DNS.: my-domain.net

Carte Ethernet Ethernet :

   Suffixe DNS propre à la connexion. . . : my-domain.net
   Description. . . . . . . . . . . . . . : Intel(R) Ethernet Connection (11) I219-LM
   Adresse physique . . . . . . . . . . . : A4-BB-AC-BA-16-A1
   DHCP activé. . . . . . . . . . . . . . : Oui
   Configuration automatique activée. . . : Oui
   Adresse IPv6. . . . . . . . . . . . . .: 2001:470:beef:5c0:2::c7(prefered)
   Bail obtenu. . . . . . . . . . . . . . : mercredi 10 mars 2021 06:51:57
   Bail expirant. . . . . . . . . . . . . : jeudi 11 mars 2021 10:04:47
   Adresse IPv6 de liaison locale. . . . .: fe80::410c:5e0d:e1a1:6075%10(prefered)
   Adresse IPv4. . . . . . . . . . . . . .: 192.168.1.6(prefered)
   Masque de sous-réseau. . . . . . . . . : 255.255.255.0
   Bail obtenu. . . . . . . . . . . . . . : mercredi 10 mars 2021 08:18:04
   Bail expirant. . . . . . . . . . . . . : vendredi 12 mars 2021 00:38:52
   Passerelle par défaut. . . . . . . . . : fe80::215:17ff:fe77:d118%10
                                       192.168.1.1
   Serveur DHCP . . . . . . . . . . . . . : 192.168.1.1
   IAID DHCPv6 . . . . . . . . . . . : 111459181
   DUID de client DHCPv6. . . . . . . . : 00-01-00-01-26-AC-DF-8D-BB-BB-6D-BA-16-A1
   Serveurs DNS. . .  . . . . . . . . . . : 2001:470:1f13:5c0:2::1
                                       192.168.1.1

Your 'unbound' doesn't know it lives in "home.arpa" so it should (should it ?) try also
mail.home.arpa
which should be in the /etc/hosts file on pfSense, thus known to unbound, as it reads /etc/hosts at start-up.
IF not, give that host called 'mail' a static DHCP MAC lease **, or host override it on the unbound settings page.

** and keep this checked :

edit : I'm not using a domain like "home.arpa". As I need known 'cert' on my LAN, I use a 'real' (rented) domain name for internal uses and acme. I don't think that difference matters.

My unbound knows that :diskstaion2 is local, as it is definced in /etc/hosts/

.....
192.168.1.33	DiskStation2.my-domain.net DiskStation2
....

Strange to see that unbound even bothers a main root server with a non valid host name like 'mail'.

Bob.Dig · Mar 11, 2021, 7:42 AM

@gertjan Bonjour.
They all got a static mapping and this box is checked all the time.
So still no clue why this behavior changed and now has changed again.
C’est la vie...

Gertjan · Mar 11, 2021, 8:08 AM

@bob-dig said in [solved] 2.5 connecting via hostname not working across interfaces:

C’est la vie...

Coté fichier /etc/hosts : toutes tes hôtes y figurent ?

Bob.Dig · Mar 11, 2021, 8:15 AM

@gertjan I think we were there already.
Adieu

Gertjan · Mar 11, 2021, 8:33 AM

@bob-dig

I knew it. The question sounded familiar

Bob.Dig · Apr 4, 2021, 10:28 AM

I have to bring that up because it is an ongoing problem. Sometimes it works over other interfaces, sometimes it doesn't.

Bob.Dig · Apr 4, 2021, 5:25 PM

I enabled Register DHCP leases in the DNS Resolver in addition to the already enabled Register DHCP static mappings in the DNS Resolver and now it is working again, before even FQDN wasn't working. It is a mess.

Bob.Dig · Apr 7, 2021, 6:07 PM

I noticed that sometimes my windows can't connect even if via ip it is possible and even the dns resolution is working according to nslookup. It is making no sense to me.

johnpoz · Apr 7, 2021, 6:21 PM

Are you IPs changing? This isn't freaking rocket science ;) But it does require some basic understanding of dns and networking..

Bob.Dig · Apr 8, 2021, 8:04 AM

@johnpoz They don't change but the windows smb shares don't work anymore, unreachable, although via IP it is working.
But I don't know what the reason is, an ARP problem maybe? It is two Windows PCs across different interfaces.

But I just noticed that the problem was different when I started this thread. It somehow looks related to me but it might not be.

johnpoz · Apr 8, 2021, 9:53 AM

Well troubleshoot the problem - if its not working via IP, it has zero to do with name resolution.

Sniff - what happens.. Does pfsense send on the syn.. Then its not pfsense..

Bob.Dig · Apr 8, 2021, 1:10 PM

@johnpoz It always does work with IP, names some of the time.
But to my later problem, I had ACL one machine to use the resolver only for local stuff. Maybe windows will not use it anymore and will favor the other... hard to tell. I switched to ip and will stay there, at least in that vm.
The original problem, RDP just over the hostname seems gone, it always works so, even across interfaces.

johnpoz · Apr 8, 2021, 1:10 PM

@bob-dig said in 2.5 connecting via hostname not working across interfaces:

I had ACL one machine to use the resolver only for local stuff.

Huh? How exactly do you think that could work? While sure you can set the ACL to only be able to resolve local stuff. How would that client then resolve public stuff? You can't just point a client to 2 different NS that resolve different things and not have problems.

Bob.Dig · Apr 8, 2021, 1:11 PM

@johnpoz It worked for some time... but it is probably the reason for the latest problems.

Bob.Dig · Jun 30, 2021, 6:31 PM

I once again had to reinstall a fresh pfSense and guess what is not working again, RDP only via hostname.
But it seems related to using DHCP on my Windows. If I am using DHCP for IPv4, I can connect via hostname. If I dial-in the same settings manually, I only can connect via FQDN.
So it is all a windows "thingy". Weird but now I know at least this.

johnpoz · Jul 1, 2021, 6:37 AM

@bob-dig You can not resolve just hostname unless you are on the same L2 and broadcast for it.

If you actually setup your network correctly be able to resolve everything via FQDN, and your window devices would auto add the domain your using locally via domain suffix.

This is a layer 8 issue...

Bob.Dig · Jul 1, 2021, 6:38 AM

@johnpoz said in (solved) 2.5 connecting via hostname not working across interfaces:

This is a layer 8 issue...

I got you.

But there is still one missing puzzle peace. Why the heck it will work after some time (weeks), even if I dialed in the settings my self only in the first window of the IPv4 Properties, missing out on the DNS suffix field? Only Windows knows.

johnpoz · Jul 1, 2021, 1:47 PM

@bob-dig said in (solved) 2.5 connecting via hostname not working across interfaces:

missing out on the DNS suffix field? Only Windows knows.

Huh?? Sorry I can not make any sense of that... You either broadcast for a hostname, or you resolve a fqdn.. There is no "puzzle" to it..