Connecting 2nd LAN device to router crashes network

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Sulfurous

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Jun 8, 2015
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Hi,

I have a Linksys EA3500 (most recent firmware) and I'm connecting 1 laptop and 1 PC to it (or trying).

When only 1 device is plugged the network works so does the internet.

When I connect both LAN wires the network crashes on both pcs, the lights for each lan wires go black but the internet ones still work. They start blinking again 30 seconds later but the network never returns.

If I disconnect one of the devices (either, I tried alternating both) then it connect to the network and the internet returns.

What is going on?

Thanks

 
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JackNaylorPE

JackNaylorPE

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Oct 30, 2004
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Have you tried shutting down the system... completely. Modem / Router / All PCs / All lappies / printers and anything else 'on the network' (i.e. MCell PS4, XBox whatever). Go make a sammie and eat lunch ... Then, with all cables connected, start the modem, wait a minute, start the router, wait a minute, start the PC with your Router app on it. Look at the Router network mapping noting the assignment of IP addresses . I keep a spreadsheet with Macine N, / Name. MAC address, I{P address and other data .. you can fill this out as each machine boots..

Then start the lappie and see what happens ... BTW, is the wired or wireless connection ? Continue starting all devices allowing each one to show up on the routers map page listing IP addresses. Make sure to refresh ya browser window after each item is started.

You might have for example:

Default Gateway 192.168.1.1
Subnet Mask 255.255.255.0

and then columns for

Item No. = 1
Device Name = MicroCell
IP Address = 192.168.1.2
Mac Address = 17:34:C6:48:G2:BA
Connection Type = Wired

Item No. = 2
Device Name = Main PC
IP Address = 192.168.1.3
Mac Address = 71:42:7H:99:Q2:AB
Connection Type = Wired

Network printers should have high numbers
Item No. = 9
Device Name = Large Format Plotter
IP Address = 192.168.1.10
Mac Address = 42:71:H8:33:Z2:VF
Connection Type = Wired

Then com the wireless items like ya lappie

Item No. = NA
Device Name = Work laptop
IP Address = 192.168.1.x
Mac Address = 91:48:7K:25:L3:BH
Connection Type = Wireless

I prefer to have the wired devices assigned a specific IP address, on the MFP and Plotter, this was essential, as well as for the MicroCell. The wireless devices I let DNS handle.

I have used this technique on several networks to quickly identify where issues lie.
 
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S

Sulfurous

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Jun 8, 2015
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This is what my PC gives me:

Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.

C:\Users\Guillaume>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Lone-OC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : northwestel.net

Ethernet adapter Ethernet 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Kaspersky Security Data Escort Adapter
Physical Address. . . . . . . . . : 00-FF-D1-33-94-CD
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Win32 Adapter V9
Physical Address. . . . . . . . . : 00-FF-97-D0-05-06
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter VPN - VPN Client:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VPN Client Adapter - VPN
Physical Address. . . . . . . . . : 00-AC-CC-1E-87-34
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Local Area Connection* 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter
Physical Address. . . . . . . . . : 6E-71-D9-78-C5-3D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wi-Fi:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
Physical Address. . . . . . . . . : 6C-71-D9-78-C5-3D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . : northwestel.net
Description . . . . . . . . . . . : Intel(R) 82579V Gigabit Network Connectio
n
Physical Address. . . . . . . . . : 60-A4-4C-62-33-CF
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::5cb8:c74c:81b:2d2c%3(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.145(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, July 30, 2017 7:58:07 AM
Lease Expires . . . . . . . . . . : Monday, July 31, 2017 8:10:02 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 56665164
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-59-16-A5-60-A4-4C-62-33-CF

DNS Servers . . . . . . . . . . . : 8.8.8.8
8.8.4.4
NetBIOS over Tcpip. . . . . . . . : Enabled
Connection-specific DNS Suffix Search List :
northwestel.net

Ethernet adapter VMware Network Adapter VMnet1:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet
1
Physical Address. . . . . . . . . : 00-50-56-C0-00-01
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::80ea:67a:84aa:62%21(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.27.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 385896534
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-59-16-A5-60-A4-4C-62-33-CF

DNS Servers . . . . . . . . . . . : 8.8.8.8
8.8.4.4
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter VMware Network Adapter VMnet8:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet
8
Physical Address. . . . . . . . . : 00-50-56-C0-00-08
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::a973:2b6a:520c:88d%22(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.121.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 402673750
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-59-16-A5-60-A4-4C-62-33-CF

DNS Servers . . . . . . . . . . . : 8.8.8.8
8.8.4.4
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{A1AB9B3C-9BC3-47B1-A01D-E972F914CC94}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{55924254-466A-4BA1-B258-28776910FC8E}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:6ab8:c16:2c56:b3f6:d6a0(Prefe
rred)
Link-local IPv6 Address . . . . . : fe80::c16:2c56:b3f6:d6a0%6(Preferred)
Default Gateway . . . . . . . . . : ::
DHCPv6 IAID . . . . . . . . . . . : 335544320
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-59-16-A5-60-A4-4C-62-33-CF

NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.{0465CEE4-423A-493F-9784-CD43A06A9AB2}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : northwestel.net
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

C:\Users\Guillaume>

This is what my laptop says:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Lone>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Lone-Laptop
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : northwestel.net
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 90-E6-BA-6A-7E-8E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Atheros AR928X Wireless Network Adapter
Physical Address. . . . . . . . . : 00-25-D3-04-EC-C8
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:79fb:48e:211e:b3f6:d6a0(Prefe
rred)
Link-local IPv6 Address . . . . . : fe80::48e:211e:b3f6:d6a0%17(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.northwestel.net:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #6
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{3009F04D-07E2-4BAB-8A88-6C72D2929FC9}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #7
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

C:\Users\Lone>
 
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S

Sulfurous

Honorable
Jun 8, 2015
73
0
10,660
Same results. I have ipv6 deactivated on both PC.

I tried shutting everything down, plugin all network wires then powering up the router only. When the power's light remained constant I powered up both pcs. the green and orange lights on both wire were light. Then i plug in the internet rj45 then both PCs get internet within 30 sec. 20 seconds later the network crashes on both PC and the power light of the router starts blighting endlessly.

It only stops when I unplug 1 of the LAN wire and wait 30 sec.

Seems I can only connect 1 device at a time or else the network goes a-wire.

 
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