How to assign Domain Controller to VLAN Systems

[slkamath]

@stephenw10
Thank you very much.

Ok. Then we initially had an DHCP with Windows DC. but now I unauthorized it from DHCP (6 months back). may be that is the cause i think. If i can remove that machine from network my issue will be solved.

I will do that tomorrow and I will inform you.

Lokesh Kamath

[johnpoz]

If the boxes are ubuntu.. you can still view the same info just different way. Network Manager would be the gui way.

Very simple test would be traceroute fqdn of smtp server

Where does it fail? Does it even fail to resolve? Does it not get paste hop 1, you should do this test when working - does it take another path when not working, etc. etc.

[slkamath]

@johnpoz
Thank you very much.

Ok. I will Check & update you tomorrow.

Lokesh Kamath

[slkamath]

@johnpoz

I removed the Old Windows DC from the Network but still no luck.

Lokesh Kamath

[johnpoz]

Where did I say anything about the OLD DC? If you want help if figuring out what is wrong your going to have to give us some actually info to work with!!!

Your smtp server is outside - can you not reach it, can you not resolve it?

[slkamath]

@johnpoz
Thank you John.

Sorry.

SMTP Server is resolving no issue with that.

traceroute mail.laxmielectronics.com - Result

Marketing-VLAN

Quality-VLAN

Lokesh Kamath

[stephenw10]

That appears to be going via a completely different route. You don't even a 192.168.1.0/24 subnet on your pfSense firewall.

I suggest that device at 192.168.1.1 is some other rogue gateway device. Do you even have an account with actcorp.in?

Steve

[slkamath]

@stephenw10
Thanks Steve

No We don't have actcorp ISP. I think the user has connected to his own wifi Internet due to it is showing like that.

I am sorry for that. Please excuse me. I will once again post the right details tomorrow.

Our ISP Spectra.

Lokesh Kamath

[johnpoz]

hop 2 in that trace 10.253 at 1700ms ??? WTF?? Yeah no wonder they having problems.. Whatever it is they are doing they are not going through your pfsense.

And a 13ms 1st hop is horrible - and most likely wifi.

[stephenw10]

Yup, or cellular. 10.243 smells like CGN to me.
Wouldn't be the first phone configured as a hotspot I've seen breaking stuff.

Steve

[slkamath]

@stephenw10 @johnpoz
Thank you very much.

I am sorry for giving wrong info.

Traceroute Output.

LAN Traceroute

Marketing Traceroute

Purchase Traceroute

Lokesh Kamath

[johnpoz]

Does it work when you did those traceroutes?

[slkamath]

@johnpoz
Thank you.

Yes it is working when i give traceroute mail.laxmielectronics.com.

Lokesh Kamath

[johnpoz]

Well there you go then you have your root cause - users not using your connection when they fail ;)

The HUGE delays in that network could be a problem, or more than likely that isp they are going out blocks outbound 25.. If that is the port your talking to vs say 465 or 587 which are typical ports talking to smtp server when using encryption..

So now you need to figure out why that one that was failing was using that other network..

[slkamath]

@johnpoz
Thank you.

We are using most of the Ubuntu system 465 and windows system with 25 and Network Printers use 587 Pots.

Ubuntu can use 465 or587 no issues with that.

Windows Outlook will not work in 465,587 only work with 25.

Network printers will work in 587, 25 not in 465.

Those who are in LAN (nearly 30 Systems) dont have issues while sending mails or accessing Shared folder's. Only VLAN systems are having this issue.

Lokesh Kamath

[johnpoz]

@slkamath said in How to assign Domain Controller to VLAN Systems:

Windows Outlook will not work in 465,587 only work with 25.

That is NOT true at all.. Sorry but BS... on that - windows outlook can and does work on those ports if correctly configured.

You just stated clients are working when you did those traceroute - NO shit they might not work if yous end them out so wifi hotspot connection..

If a client is not working before you go resetting its interface - do some basic 101 troubleshooting for gosh sake.. .How is it your in charge of the firewall and don't grasp basic connectivity troubleshooting?? If your client is using port XYZ and its not working... Sniff on the firewall is the client actually sending SYN on that port, is it being blocked? Do you allow it in your rules.. Sniff on your wan are you sending it out? etc. etc...

[stephenw10]

Yes, we need to see a traceroute from a machine on one of the affected subnets when it is NOT working.

If you see no hops at all when you try that then check the connection information. Most likely it is no longer using pfSense as it's gateway.

Steve

[slkamath]

@stephenw10 @johnpoz
Thank you very much.

I am sorry I am configuring first time. I dont know anythng.

So most of the things i am searching in google and trying. Please dont mind. I am asking some basic help with very good experts. So Sorry for that.

Configured correctly in outlook. if I configure 465 and test it will fail. 587 is working fine.

Allowing & Blocked Ports mentioned already

If VLAN Clients are idle for 10 to 15 min we are facing the issue of disable & enable network.

Please find the below picture for better understanding.

Marketing-VLAN
When it is not working if i run traceroute command

Before Disable & Enable Network

After Nework Disable & Enable (in Picture you can see wired connection connected)

Traceroute After Nework Disable & Enable

===============================================================

Purchase-VLAN
When it is not working if i run traceroute command

Before Disable & Enable Network. Printing also holding. In picture you can see the print icon

After Nework Disable & Enable (in Picture you can see wired connection connected)

Printing is completed After Nework Disable & Enable

Traceroute Output after Nework Disable & Enable

[johnpoz]

So from that you can not just resolve it?

Can your clients resolve anything? Do a simple nslookup or dig for mail.laxmielectronics.com

Can you traceroute to its IP vs its name.. 142.4.7.34, Can you ping IP of pfsense - oh prob not because you are not even allowing basic icmp for troubleshooting..

And lets go over this yet AGAIN!!!~~ your rules are pretty much pointless... Those allow rules mean zero when below them you have an ANY ANY... Other than you saying your limiting bandwidth on that rule? Is that the case?

So your clients are pointing to DC for DNS? Thought you removed them? Where do the DCs get their dns - do they forward do they resolve? What network segment are they in? What are their rules for outbound to dns if resolving.

When you enable/disable the interface - what was it before?? Do a simple ifconfig output.. What was your IP of this device? What was its routing, do a simple netstat -nr

What version of linux you running can you run
systemd-resolve --status

Oh that looks like ubuntu... about about
nmcli dev show | grep DNS

I don't have a ubuntu handy with nmcli installed? or network manager

how about simple output of nslookup, it should tell you who your using - but more than likely just show you loopback as your prob running local cache. How about simple cat of resolv.conf

cat /etc/resolv.conf

[stephenw10]

Yes, your firewall rules need rationalising at some point but they are not the cause of the issue here.

You are losing, at least, DNS resolution when the connection fails. The easiest thing to do here is to grab screenshot of the connection information from the Network Manager on a client when it is working and when it fails.

That will show the IP, subnet, gateway and DNS server(s) it's configured to use.

Steve