Router and switch block the signal?

Hi all!

This is a total mystery. Signal from cable is fine. Works on its own. However when I direct the cable into a router or switch, I get limited connectivity, which is no connectivity. I tried two switches and a one router with identical results. All of these devices have worked on that spot before without any issues. This problem occurred right out of the blue as far as I can tell and left me completely baffled.

It is mainly a wired issue but the limited status also affects wireless in case of the router. TP link products all three.

Any ideas?

Using CAT5 or better, link everything up the way you normally would/did, then run ipconfig /all from a command prompt and post your results. Check the connection from router to modem. Switch and swap the cables around and let us know what you find.

Hey, I understand very little from what you wrote.
- where does this cable come from? Isp modem?
- if there is modem - is it in bridge mode or get the ip itself?
- do you connect the cable to router wan port? Usually a different color rj45 port

Would you please attach cable directly and open command prompt. Run ipconfig -all
Post results here

Give some more detail

Both setups have the same ip so either you seem to have a good connection to the dhcp server (your routerboard ?) or ip wasn't refreshed.

Did you ipconfig -release Then ipconfig -renew ?
Run above commands with switch in between and see if you get the same ip

For future reference if modem is in bridge mode, the modem is transparent and your router outer port gets internet ip.

If you add router in between make sure routerboard cable comes in to the wan port of 2nd router or dhcp server of both will be in conflict

I rebooted every single device in the building. Apparently a completely peripheral router had crashed and it somehow dicked up the entire network... not allowing other routers and switches to connect. With the connection issues stretching back all the way to the first switch connected to the ISP routerboard. So, yeah.

We could theorize further on what exactly happened, but the crisis has been averted.

Thanks for the input, guys!

Disregards previous good news. The issue is back and no number of reboots is helping.

GokAy said:

Both setups have the same ip so either you seem to have a good connection to the dhcp server (your routerboard ?) or ip wasn't refreshed.

Did you ipconfig -release Then ipconfig -renew ?
Run above commands with switch in between and see if you get the same ip

Did that:

Before release:

C:\Windows\System32>ipconfig -all

Windows IP Configuration

Host Name . . . . . . . . . . . . : ENO2
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : B0-10-41-D5-C0-B8
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. . . . . . . . . : B0-10-41-D5-C0-B1
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter WiFi:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Ralink RT3290 802.11bgn Wi-Fi Adapter
Physical Address. . . . . . . . . : B0-10-41-D5-C0-B7
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe FE Family Controller
Physical Address. . . . . . . . . : 14-58-D0-C3-43-A3
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::80ed:2ca6:9341:2fec%3(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.4.103(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 25. mai 2015 11:18:57
Lease Expires . . . . . . . . . . : 27. mai 2015 17:38:46
Default Gateway . . . . . . . . . : 192.168.4.1
DHCPv6 IAID . . . . . . . . . . . : 51665104
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1B-8B-72-EB-14-58-D0-C3-43-A3

DNS Servers . . . . . . . . . . . : [censored]
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{51BB1EDC-E19B-41CC-97C2-A45810C71FAD}:

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 Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected
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

C:\Windows\System32>

Release-renew

C:\Windows\System32>ipconfig -release

Windows IP Configuration

No operation can be performed on Bluetooth Network Connection while it has its m
edia disconnected.
No operation can be performed on Local Area Connection* 2 while it has its media
disconnected.
No operation can be performed on WiFi while it has its media disconnected.

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Wireless LAN adapter Local Area Connection* 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Wireless LAN adapter WiFi:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::80ed:2ca6:9341:2fec%3
Autoconfiguration IPv4 Address. . : 169.254.47.236
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :

Tunnel adapter isatap.{51BB1EDC-E19B-41CC-97C2-A45810C71FAD}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

C:\Windows\System32>ipconfig -renew

Windows IP Configuration

No operation can be performed on Bluetooth Network Connection while it has its m
edia disconnected.
No operation can be performed on Local Area Connection* 2 while it has its media
disconnected.
No operation can be performed on WiFi while it has its media disconnected.
^C
C:\Windows\System32>

You terminated the command before ipconfig for Ethernet port reported. What was the ip after renew?

Can you open MSPaint and draw a very simple diagram of your network please?

Include all devices modem/router/switch/computer - also write the static IP numbers of applicable devices, and any all DHCP servers running on routers.

It should take 10 minutes tops. Thanks!