Linksys SRW248G4 switch is killing my router

hello all. i hope someone can help me with this.
i run a business network. it is very simple.
we have a comcast business class router plugged into a linksys SRW248G4 switch.
everything runs fine for a while but at times during the day i am locked out of our comcast router.
we have had comcast come out and look at it many times. they have replaced the router 3 times.
comcast tells me that it must be the switch.
the problem is that when i log into the router. 192.168.1.1 i get an error message
Document Error: Data followsAccess Error: Data followsCan't get memory
if i go and unplugg the router and plug it back in, than i can log into it.
so, is it possible that the linksys switch has something to do with this? i have not changed any settings. the switch is just plugged in right out of the box.
is there something i can change or try?

I don't see any reason for the router to affect your switch. If you could just give the details of the router (model, manufacturer and firmware version) it would be better for us to check on the possibilities.
Another thing is that, I don't remember any switch that will cause problem with the router if you were just using the switch as a passthrough to the router.

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Here's what worked for me:
My router config was correct to begin with.
Router-A (Cisco 2611):
interface Ethernet0/0
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encapsulation dot1Q 2
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Leave the workstation ports "Untagged".
(This is where I was screwing up)...
"Include" the Trunk port AND select "Tagged".
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Thakns for the help guys!
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Hi everyone,
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How to change SSID for Linksys wireless switch for PC?

imac-G5 Mac OS X (10.4.4)

Now, let's try to brake this issue down:
I need the Linksys to get a PC (Dell) running wireless. I installed a motorola PCI card for ethernet & the software that came with it in the PC. The switch does not read the network.
This involves a networking issue on a PC running Windows
The last time I spoke with Linksys they suggested http://192.168.1.1/same address, also 192.168.1.225. I get network connection errors.
This is an issue of your network setup
I have my Powerbook hard wired to the Motorola wireless router. My I-Mac is wireless.
So PowerBook & iMac work fine. Right?
You also have a Motorola Wireless Router, is this also your broadband modem?
I hooked up the Linksys switch to the modem with ethernet cat 5 cable. I still get connection errors. Neither computer can access these links. I get Motorola's broadband page with 192.168.1.1. I've done as much as I know but can't change the ssid if I can't access the Linksys switch. HELP Please!
This is a bit confusing:
What do you mean by connection errors? Unable to connect, able to connect but the connection drops?
Try this:
Shutdown your PC and both of your Macs
Turn of the Linksys switch and unplug it from the Motorola Router
Unplug the PowerBook which is wired to the Motorola and directly (with the same ethernet cable) connect it to the Linksys switch
Turn on the Linksys switch
Turn on your PowerBook
Open Safari or any other browser and go to: http://192.168.1.225 or http://192.168.1.225 (or whatever address Linksys told you)
Configure your Linksys switch (Change SSID) and save new settings
now, if everything goes fine, then:
Connect the PowerBook to the Motorola Router (just as it was before)
Connect the Linksys switch to the Motorola Router via an Ethernet Cable
Try to connect (from your PowerBook via Safari) to the Linksys switch@ http://192.168.1.225 or http://192.168.1.225 (or whatever address Linksys told you)
Keep the iMac and the PC shutdown untill you manage to set up the Linksys switch propperly
Post back feedback
a few Macs running 9.x, a bunch of Macs running 10.4.x and some serious SGI workstations running Irix 6.5.x
Message was edited by: fu

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Jon

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NM-16ESW - adding a switch into a 3725 router slot - can i route traffic out of the switch ?

Hi all,
I have added the above module R16#show ip int br
Interface IP-Address FastEthernet0/0 unassigned FastEthernet0/1 unassigned FastEthernet1/0 unassigned FastEthernet1/1 unassigned FastEthernet1/2 unassigned FastEthernet1/3 unassigned FastEthernet1/4 unassigned FastEthernet1/5 unassigned FastEthernet1/6 unassigned FastEthernet1/7 unassigned FastEthernet1/8 unassigned FastEthernet1/9 unassigned FastEthernet1/10 unassigned FastEthernet1/11 unassigned FastEthernet1/12 unassigned FastEthernet1/13 unassigned FastEthernet1/14 unassigned FastEthernet1/15 unassigned Vlan1 unassigned R16(config-if)#int fa1/0
R16(config-if)#ip address 192.168.10.1 % IP addresses may not be configured R16(config-if)#
q1) Not being able to set IP q2) in that case, since the Assuming fe0/1 on the router and 2 workstations attached Regards,
Noob (16 switch port) into my router.
OK? Method Status Protocol
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset administratively down down
YES unset up down
255.255.255.0
on L2 links.
to the interface as shown above, I would believe it is really a switch port. Is there anyway I can see what kind of port a interface is or can be ? (switch port, routed port etc ?) or whether is it a L2 or L3 switch ?
switch is already inside the router, how do i route L3 traffic out of the switch ?
is the interface connected to external network.
to the switch ports fe1/1 and and fe1/2, how can i set their gateway to point to fe0/1's IP ? Can fe0/1 to be connected to fe1/0 internally ?

Hi KOE SIZE JIE,
q1) I tried the no switchport command on the 16switch port module and it works. I can set an IP on the switch port. But according to Liam, it is a L2 switch, how come we can assign no switchport command ?
As Bilal pointed out, I was mistaken you can issue the "no switchport" for a L3 routed port on that specific module.
q2) it is said that on a L2 switch only 1 SVI can be connected (for management purpose only) and L2 switch is not able to do routing. With the L2 switch module inserted into the router, will the SVI be able to do routing then ?
I believe this goes back to what Bilal was saying about limited functionality on the EtherSwitch. I will have to play with one in GNS3 to give you a solid answer.
But I think what it is trying to say is... You cannot use SVI's for inter-vlan routing. You can only have a single SVI for management purposes.
q3)Liam, you mention earlier fa0/0 is pointing to some network. is fa0/0 in the same router as the 16 switchport module ?
ip route 10.10.10.0 255.255.255.0 192.168.1.254 -- this command seems to be saying to access the 10.10.10.0 network, please go to the next hop IP 192.168.1.254 (but again, you are setting this next hop IP on the current router interface itself) - did i get anything wrong ?
I have read back my post and this reads wrong.
When i showed you the code snippet, 192.168.1.254 would be the interface on the next hop router. Not the router you are issuing the ip route command on. You would also need an IP address on the router interface directly connected to the next hop router. I.E 192.168.1.253
You will not then receive that error. Sorry about that, my sloppy config without a diagram!
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HT4519 I switched to a Cisco Router model EA6500, in now periodically receive a message on both of my email accounts "cannot get email" the connection to the server failed" it's happening on both by iPad and iPhone. I've talked to Cisco and they couldn'

I switched to a Cisco Router model EA6500, in now periodically receive a message on both of my email accounts "cannot get email" the connection to the server failed" it's happening on both by iPad and iPhone. I've talked to Cisco and they couldn't help

Start by working throudh the Troubleshooting iOS and WiFi knowledge base article and see if that helps the situation. When you get to shutting down the router, be sure to disconnect power as shutdown on some is really just standby mode.

IPhone is KILLING my router

Wifi isn’t working for more than 6 months even though I tried everything!
I updated it to 3.2.1 and still it doesn’t detect any network at all!
BUT when I ran some apps, out of the sudden, I got a pop up window detecting my neighbor’s network! This happened only for 3 or 4 times!
I was wondering why it didn’t detect my network so I went really close to my router trying the same thing and then something strange happened!!!
My iphone “killed” the router! It wasn’t working after that!
I know, this sounds weird so I put it on video!
I explain the whole situation on the description!
What’s going on?
I think that’s really serious!!! Is it going to deactivate any device with a wifi antenna?
http://www.youtube.com/watch?v=7fN0ryfR7PQ

I think that shouldnt be the problem, May be your Iphone when its near to the Router and it must be causing interference between your router. So i think you need to change some settings on your Router this will solve the Problem. Try doing this settings on your Router.Open an Internet Explorer browser page.In the address bar type - 192.168.1.1
Leave username blank & in password use admin in lower case...
For Wireless Settings, please do the following : -
Click on the Wireless tab-
-Here select manual configuration...Wireless Network mode should be mixed...
-Provide a unique name in the Wireless Network Name (SSID) box in order to differentiate your network from your neighbours network...
- Set the Radio Band to Standard-20MHz and change the standard channel to 11-2.462GHz...
- And wireless SSID broadcast should be Enabled and then click on save settings...
Please make a note of Wireless Network Name (SSID) as this is the Network Identifier...
For Wireless Security : -
Click on the Sub tab under Wireless > Wireless Security...
Change the Wireless security mode to WEP, Encryption should be 64 bits.Leave the passphrase blank, don't type in anything...
Under WEP Key 1 type in any 10 numbers please(numbers only and no letters) and click on save settings...
Please make a note of WEP Key 1 as this is the Security Key for the Wireless Network.
Click on Advanced Wireless-
settings>>Change the Beacon Interval to 75 >>Change the Fragmentation...
Threshold to 2304 Change the RTS Threshold to 2307 >>Click on "Save Settings"...
Now see if you can locate your Wireless Network and attempt to connect...

Router interface up connected to switch interface down - but router status = up.

Hi all,
My router R2 fa0/0 and fa0/1 are connected to 2 L3 switches on their fa0/2 ports respectively.
I have shutdown all interfaces on the L3 switches. but on my router, i still see
R2#show ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            192.168.3.1     YES manual up                    down
FastEthernet0/1            192.168.4.1     YES manual up                    down
======================================================================
I would have thought if i have shutdown the switches interfaces, the respective interfaces on the Router would be down too.
Is it not the case ?
Regards,
Noob

Hi KOH SZE JIE,
This is normal behavior; If you have an interface UP; the line protocol may go up and down. But the Status (of the interface) will not change unless you make a configuration change.
Please see below a breakdown of your "show ip int brief"
Method
is set to 'Manual' This means you manually configured the interface from the CLI.
Status
is 'UP' This means the interface is up. Basically this means you did a "no shutdown" on the port.
There are three modes here
Down - The interface is shutdown (Default on most routers)
Administratively down - You have gone under the interface and issued a "shutdown"
UP - You have issued a "No shutdown" on the interface.
Protocol
Down - This means a routing protocol is not active on the interface. This makes sense as you have shutdown the remote end(in your case your L3 switch.
I hope this helps.
Kind Regards,
Liam
*** EDIT ***
After a bit of digging, I found the following Cisco document; this explains the entire show command more concisely then I could :)
http://www.cisco.com/c/en/us/td/docs/optical/cpt/r9_3/command/reference/cpt93_cr/cpt93_cr_chapter_01110.html

Standard Catalyst switch vs. Enhanced routing version

I have question regarding the Cisco catalyst switches with the enhanced routing option.
As I understand it to do layer 3 routing between vlans on a standard catalyst switch IOS requires me to configure a port on the switch with 802.1Q, plug that port into a seprate router and configure the router's port (also configured with 802.1Q) as a 'router on a stick' for each vlan i need to route. Then any additional switches I want to add to the network I would simply trunk them back to the switch that has the router plugged in so i could have inter-vlan routing. Does this sound correct?
Now if I used a switch with the enhanced layer-3 IOS (A WS-C3560G-24TS-E for example) would i be able to remove the extra router from the design? would the packet routing go at the speed of the back-pane of the enhanced switch, rather than the wire-speed of the connection to a external router? I would also be able to get a gigabit SFP for each of my additional switches (3500XL's) and plug them into a trunked port on the 3560 thus giving a full gigabit trunk to each access layer switch.
Or would a router on a stick be a fine solution for inter-vlan routing? There will be a need for a integrated services router in the future to act as our CME for this site, so we will be purchasing a router anyways.

Hi Friend,
If you have layer 3 switch with standard image then also you will be able to configure intervlan routing on layer 3 switch.
Enhance image on layer 3 switch will let you configure routing protocols like ospf, bgp and enhance qos features whih is not possible with standard images.
But just for intervlan routing any layer 3 switch like 3550,3560 will let you achieve inter vlan routing without using external router.
Have a look at this link for intervlan routing on layer 3 switch like 350/3560 switches
http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008015f17a.shtml
HTH, if yes please rate the post.
Ankur

Linksys SRW248G4 switch is killing my router

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