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VLANs on Netgear FSM7328s Switch

Posted on 2012-12-28
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Last Modified: 2013-04-05
Hi All,

I am also trying to create 3 vlans on a FSM7328s so I can separate the network to work on machines that are infected.

I have done the following so far.

1. Default vlan - IP 192.168.0.253 (our main network)
2. Created a vlan 10 - IP 192.168.2.254
3. Created a vlan 100 - IP 192.168.100.254

I setup a laptop on for each vlan and can ping each gateway and CANNOT ping each laptop. Now, I need to be able get on the Internet with both laptops on each vlan but still not ping each other.

This is where I am having the problem. I am assuming that I need to create a "trunking" port on the netgear, but I cannot figure it out.

Would love some help with this.

Thanks!
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Question by:itsupportmd
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LVL 11

Expert Comment

by:rharland2009
ID: 38727135
That's right. The uplink that goes from this switch to your production network needs to be a trunk so that traffic from each of the VLANs can traverse the link. Remember, too, you'll need routing information on your production routing/switching gear so that packets can get back to the VLANs in question as well. When those packets come into your network destined for the laptops in the isolated VLANs, they'll need to know how to get there.
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Author Comment

by:itsupportmd
ID: 38727178
Thanks for the reply. Ok, so I have created static routes in my router, but I still don't know how to make the port on the Netgear switch which connects to my production network a trunking port.
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Expert Comment

by:rharland2009
ID: 38727219
You want to set that port to be in both your VLANs as well as the default VLAN that delivers traffic to your network. They'll need to be untagged at the access (laptop) side and tagged on the egress/trunk side.
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Author Comment

by:itsupportmd
ID: 38727233
Thanks, but that is the problem. I can't figure out how to get that configured.
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Expert Comment

by:rharland2009
ID: 38727249
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Author Comment

by:itsupportmd
ID: 38727320
Thanks, but the FSM7328s switch does not have that interface.
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Expert Comment

by:rharland2009
ID: 38727343
Here's your admin guide.



http://www.downloads.netgear.com/files/gsm7212_gsm7224_gsm7248_60015_adminguide.pdf

Specifically, in example #4 under the Vlan Configuration section...

Switching --> VLAN --> Port Configuration. To specify the handling of untagged frames on receipt,
and whether frames will be transmitted tagged or untagged.
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Author Comment

by:itsupportmd
ID: 38727448
Ok, thanks. I was able to figure out how to make that port connecting to the production network tagged. I now can ping everywhere on the production network, but I am still unable to get on the Internet.

I tried using the router for dns, my dns server, and the isp, but no go. Any ideas? I now I am probably missing something simple.
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Expert Comment

by:rharland2009
ID: 38727455
when you do a tracert -d to an internet location from these problem laptops, what happens?
Paste a tracert to google or something so we can see where it fails.
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Author Comment

by:itsupportmd
ID: 38727491
I did tracert -d www.google.com and google.com and the error returned was.....unable to resolve target system name
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Expert Comment

by:rharland2009
ID: 38727505
Okay. Does your DNS server know how to get back to your laptops from a routing perspective?
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Author Comment

by:itsupportmd
ID: 38727516
Hmmm..I dont' know that answer, so I am assuming probably not. How to I tell it?
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Expert Comment

by:rharland2009
ID: 38727536
get on your DNS box and try to ping to one of the laptops that cannot access the internet.
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Author Comment

by:itsupportmd
ID: 38727571
ok. I can ping both vlan gateways, from the dns server.
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LVL 11

Expert Comment

by:rharland2009
ID: 38727578
Okay. Can you ping the laptops themselves from the DNS server?
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Author Comment

by:itsupportmd
ID: 38727588
no
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Expert Comment

by:rharland2009
ID: 38727598
okay.
Do you have the laptops' default gateway set as the VLAN gateway address?
IS windows firewall on?
Do this....do an nslookup of www.google.com and record the IP. Get on one of the problem laptops and do a tracert -d of that IP address. Let's figure out if it's routing, DNS, or a combo that's screwing you up here.
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Author Comment

by:itsupportmd
ID: 38727652
Ok. Laptop's gateway is the vlan gateway.

nslookup from Google.com - 74.125.228.71
From the laptop, I did tracert -d 74.125.228.71 - stopped at first hop which is the vlan gateway with destination unreachable
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Expert Comment

by:rharland2009
ID: 38728221
do you have the port that the laptop is plugged into on your switch in the appropriate VLAN?
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Author Comment

by:itsupportmd
ID: 38728308
Yes, that port connects to another simple switch on our network. We can ping everywhere and even remote desktop to the servers on the production network, but cannot surf the Internet.

I even tried changing the static routes on the router to point to the gateway of the default vlan gateway instead of .1 which is the production gateway.
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Accepted Solution

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rharland2009 earned 2000 total points
ID: 38736510
Okay, what routes are on your router? Do packets coming in from the internet know how to get to your laptops on these new VLANs?
Secondly, you've said you can ping stuff on your production network, RDP, etc. inside the building, but cannot get DNS resolution.
I'm assuming you can ping your DNS server.
Can you run nslookups against it from the command line on one of the problem laptops?
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