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Router can not access WAN

Posted on 2014-01-24
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Last Modified: 2015-05-11
I am having an issue with a network setup.  It could be what I am trying to accomplish.

I have a 100mb( fulldp ) connection coming on to my site.

I have the single connection connected from the 100mb circuit going to a un-managed 3com switch.

On the 3com switch I have 2 devices connected.  A sonicwall md250 and a linksys router.  

Each device is nating IP addresses onto the same subnet.  

Sonic wall -  x.x.x.178 to x.x.x.283 on a /28 subnet
linksys - x.x.x.290 on the same /28 subnet.

The problem is the firewall is working fine but when I plug in the linksys router it can not get out the internet.  I have checked the gateway address and range addresses and everything is fine.

If I put my laptop on the same subnet and give it the static IP of the linksys router it works  fine.  I have tried multiple routers ( stock linksys and ddwrt ) and same issue.  

Funny thing that I noticed is that the first time i hooked the ddwrt router up it worked then on a reboot of the router it stopped communicating with the gateway.

Is it the ARP table getting messed up having 2 routers on the same subnet?

Any help would be great.  My next stop was to either put a managed switch in or a router to see what is going on.

Jerry
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Question by:adminjam
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by:Miftaul
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Sonicwall and linksys are both connected directly to the internet through a unmanged switch. Do you mean, when linksys is connected, the sonicwall also stops working. Or the devices behind linksys only disconnects.

What gateway ip is configured on the linksys, is that the isp gateway.
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by:adminjam
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Yes both devices are connected directly to the internet through the unmamanged switch.  

Just the linksys stops working the sonicwall works fine.

Both devices are using the ISP gateway.
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by:Infamus
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If the ISP is directly connected to the firewall, the router's gateway has to be the IP of the firewall.
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by:adminjam
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Nope the ISP is connected to the switch as well as both routers.
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by:Infamus
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On the 3com switch I have 2 devices connected.  A sonicwall md250 and a linksys router.  

So you mean three devices are connected to the switch?
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by:BillBondo
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I know that the Linksys needs to be in router mode not gateway mode. Just a thought
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by:adminjam
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Ok yes 3 devices.  The ISP's router, Sonciwall and Linksys router.
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by:adminjam
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Yeah it is in router mode.  It was acting as a router on my old network.
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by:Infamus
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Sonic wall -  x.x.x.178 to x.x.x.283 on a /28 subnet
linksys - x.x.x.290 on the same /28 subnet.

x.x.x.178/28 is x.x.x.177-190

Is this typo?

It should be x.x.x.278/28, correct?


In that case......can you verify this?

x.x.x.277/28  ------ISP router

x.x.x.278/28  ------FW WAN IP  x.x.x.277 GW

x.x.x.290/28 -------Secondary Router x.x.x.277 GW
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by:adminjam
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yes sorry for the typo it should be 178..
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by:adminjam
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isp router is - 177/28

Sonciwall is - 178/28 to 183/28

Lynksys is - 190/28
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by:Infamus
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And what is the gate way or default route for Sonicwall and Lyncsys?
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by:Miftaul
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Can you ping the linksys WAN IP from within sonicwall.
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by:BillBondo
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Does linksys work alone without sonic?
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by:BillBondo
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I believe your subnets over lap and are incorrect. Should be 176 and 192???
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by:adminjam
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The ISP gave me the subnet if I run it through the calculator online it come up correct as a class A with IP's from 176 to 191 with 191 being the broad cast.

The ISP assigned the gateway as 177 so I have addresses from 176 to 190 to use.
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by:adminjam
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Missed a couple of questions:

Yes I can ping the lynksys from the sonicwall and from my laptop.

Never had a chance to test the lynksys by itself as we are in production on the sonicwall.

the default gateway of the lynksys and the sonciwall is .177
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Accepted Solution

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adminjam earned 0 total points
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This ended up being a problem with the SonciWall causing an ARP blackhole where it was advertising that it owned all IP addresses for the LAN segment.  There is a hidden menu where you can turn this function off.
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Author Closing Comment

by:adminjam
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I called SoncWall support after getting to answer on this forum.
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