How to assign Domain Controller to VLAN Systems

[johnpoz]

Before you go restarting your machines interfaces when something doesn't work... How about you troubleshoot WHY!!!

Are these machines windows? If so then simple

ipconfig /all

from cmd prompt will give you all the info for networking.. Does it show the proper info, what does it show for your dhcp server?

Can machine ping the box your trying to talk to for smtp? Can it resolve its FQDN? Where is this smtp server in your network? Is it outside your network?

[slkamath]

@johnpoz
Thank you very much

When it is not working
1st I will check in pfSense machine will go to ping and select the VLAN and ping the LAN & Google.
2nd I will check in my machine is it working.
3rd I will tell then to disable & enable the network. Then it will work. Now users understood that everytime it is not working then they only disable & enable.

All these machines are UBUNTU. No Windows.

Regarding SMTP i have not tried pinging from client. But I tried pinging google.com & it is pinging.

SMTP is outside network. It's in BIGROCK.IN

Lokesh Kamath

[stephenw10]

So when one machine is failing check the Connection Information in Network Manager.

A rogue DHCP server is some other device that has DHCP enabled on your network that is handing out leases instead of pfSense. Like a soho router you might be using as an access point for example.

Steve

[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