Cisco Switching/Routing :: 2940 - MacBook Pro - Can't Reach ISP
Mar 3, 2012
I have this strange problem with my Macbook pro, when I connect it to my cisco 2940 8 port switch then I can reach my ISP (websites eg. google.com) in like 2 minuttes, then something is happening on my router, because suddenly I can´t reach my ISP
This is what I have found out so far:
1. when I lose connection to my ISP then I can only ping internal ip addresses eg. another computer in my network
2. if I renew my ip address on the Macbook then it works again in 2 minutts, then the same happens again. This is my network setup:
Router -> Switch 1 -> Switch 2
I also know that it is not the Macbook, because it have got a new motherboard, and it have been reinstalled
also if I use the Macbook on a other network then it works fine.
All my other computers ( windows and linux ) works fine, no problems.
To me it looks like it is a Nat and/or DNS problem, but I can´t fine out what it is.
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Jun 6, 2013
I have two switches (sanitized configs attached) and I am trying to bond int gi0/1 and gi0/2 between the two. Then I need int gi0/3 back to the main LAN switches. These are new Vlans created 982 and 983 for these switches. Question #1: do the configurations look correct? I haven't placed any laptops on the interfaces to test interconnectivity yet but I am wondering if it will work with no default routes.
The admin team needs these switches at location A for setup then they will be moved to Location B. The only thing that sucks for me is that the network admin before me created gateway interfaces for all the local Vlans on a main router as sub interfaces. For example, for these two subnets, I need to create subinterfaces below (at location A), which is why a gave the Vlan on the switches, ip addresses.
interface GigabitEthernet0/0.982
encapsulation dot1Q 982
ip address 10.98.2.1 255.255.255.0
ip flow ingress
no cdp enable
service-policy input mark-mplsqos-in
interface GigabitEthernet0/0.983
encapsulation dot1Q 983
ip address 10.98.3.1 255.255.255.0
ip flow ingress
no cdp enable
service-policy input mark-mplsqos-in
When I move the subnet to location B, I will also move the gateway. These two switches will be used mainly for a VMWare and HyperVisor environment so Vlan 982 is for VMA network and Vlan 983 is for management. The admin tells me the software needs to tag the packets, I am not sure if I care as the switches should handle that also.
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Mar 5, 2012
I have a Cisco 2940 switch and a Cisco 1841 router. I want to build two different VLAN networks on the switch, which do not have to communicate one with each other, but those VLANS should communicate with the router.
I read a lot of articles, i tried to configure properly the switch and the router but i still don't get them work.
I set on the switch, the GigabitEthernet 0/1 port to Trunk port and i had to set it a native VLAN. The problem is that only from that native VLAN, i can ping the router.
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Mar 12, 2012
Having an issue with two Cat 2940, they have fiber 100Base-TX. Added a new Cat switch (the second on the VLAN), the existing Cat switch drops the fiber connection.
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Mar 11, 2012
I'm running into what seems a basic ip routing config problem with a Catalyst 3750 (IP Base) switch. I have several VLANS configured on the switch with IP routing enabled, and the switch is connected to the inside interace of a new ASA 5520 as follows:
ASA5520 IP (Default gateway): 192.168.1.1Switchport Gi1/0/1 is configured as a routed port, IP address 192.168.1.3 255.255.255.0Example VLAN is VLAN 100, IP address 192.168.100.1 255.255.252.0 From the switch CLI, I can ping all VLAN addresses, as well as the ASA5520, and the client laptop I'm testing with from VLAN 100.
From the client laptop on VLAN 100, I can ping all switch interface and VLAN addresses (inter-VLAN routing is working), including 192.168.1.3, but I CANNOT ping the default gateway at 192.168.1.1.
Here is the relevant configuration information on the 3750:
!
no aaa new-model
switch 1 provision ws-c3750x-24
system mtu routing 1500
[Code]....
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Dec 9, 2012
I have a cisco 2851 router as the edge router, I have a 3750G and a 3560G switch and configured intervlan routing with four vlans, also connected to the switches a four servers and one has active directory and a dns server.i am able to ping from all te servers fine from different vlans and the servers are able to ping the edge router. the problem I am having is with DNS, in the edge router i have configured the isp's dns server address in ip name-server and i am able to reach the outside world.
the problem im having is the servers are not able to reach the outside, do i need to do something in the edge router to forward it to the 3750g or do i have to add my isp's dns servers on the 3750g with ip name-server.
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Nov 19, 2012
We have recently started as Internet service provider in an open metropolitan.
We use a Cisco 3560G Layer 3 switch, where we have all our vlan where we have konfiguerat ex. Switch (config) # interface vlan 150, an interface for each VLAN capabilities such as int vlan 1 - 10/10 int vlan 2 to 30/10, int vlan 3 100/10 and so on.
Our int vlan is configured as follows:
dhcp relay information trusted
ip address <x.x.x.x> <x.x.x.x>
ip helper-address <x.x.x.x>
Ports (ex. int Gigabit Ethernet 0/1) are configured as follows:
description Uplink
switchport access vlan x
[Code].....
Now the problem; we have a customer in ex. vlan 3 who needs to access a server provided by another customer in the same vlan (vlan 3), and access to each other in the same vlan is not possible. You can access the server from any other vlan, but when it comes to access to another host in the same vlan, you will not reach it.
We suspect that the energy company has configured with pvlan isolated. If we use the command ip local-proxy-arp on each vlan, it works to reach each other, but it seems that our 3560 becomes overloaded when ip local-proxy-arp is enabled and it streaming and use IP telephony it doesn't work. The response time at ping is longer and the loss of packets increase with ip local-proxy-arp enabled. The other operators in the metropolitan also uses Cisco 3560G so the hardware should be sufficient.
We have also tried to add no split-horizon, but it made no difference. How do we get around this without negative consequences? Probably need something that makes you allow to send out the same interface that it came from, because it works as long as you are in another vlan.
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Apr 2, 2012
The Cisco 1921 router has two routed adapters. One is GE0/0 which I am using for my WAN interface. It is working properly. The 2nd interface is GE0/1 which is being used as my internal adapter. It is running NAT. When I attempt to reach the internet it fails while checking the exit interface. Here is the report.
AttributeValueRouter ModelCISCO1921/K9Image Namec1900-universalk9-mz.SPA.151-3.T.binIOS Version15.1(3)THostnameBulldog
Interface Details
AttributeValueInterfaceGigabitEthernet0/1IP address192.168.1.1DescriptionNOC Link Test Activity Summary
[Code].....
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May 20, 2013
PCs --> SG500(4 vlans) --> rv042 --> Internet..vlan 1 is able to reach the internet..vlan 2-4 cannot reach the internet, but can reach vlan 1.
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Feb 18, 2012
I'm replacing our current router with an ASA 5510 running 8.4(3) and I'm having what I think are NAT issues.From the 192.168.0.0/24 subnet, I'm able to reach the outside world (via NAT/PAT) without any issues. However none of the internal subnets (e.g. 192.168.10.0/24) are able to. Packet-tracer shows no ACL issues.
Here's my config:
ASA Version 8.4(3)
!
hostname gw
domain-name internal.mycompany.com
enable password asdf encrypted
[code].....
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May 27, 2013
I have a multiple Offices in my location , all my external users are connecting my site using Cisco Client to site VPN and accessing my 2 sites , All users are able to access my 2nd office servers which are in 10.10.0.x pool , I have a different vlan in that same location with 10.10.35.x series and users are not able to access this pool servers , I am not much familiar with Routing . i am using ASA 5520 firewall .
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May 10, 2012
I have 2691 router with following config
line console 0
login local
password xty
When i remove the login local from the line console i connect to console port and press enter it shows router prompt 2691Router> but i am unable to go to enable mode.If i telnet to router then i put username and pw then it goes straight to enable mode.
vty config is
line vty 0 4
exec-timeout 600 0
logging synchronous
login local
length 500
transport input telnet ssh
escape-character 3
Any reasons why i can not go to enable mode by console?
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Aug 2, 2012
I have a Cisco Catalyst 2940 switch, eight ports. Ports 1-4 are connected to a media converter A. Ports 5-6 and 7-8 goes to two separate servers, B and C. Let's say I want traffic from B->5->1->A then through some equipment (which just pushes the data) and back through A->2->6->C without the data just recognizing a shorter path B->5->6->C and thereby skipping the equipment in between. Is this possible without a router? Ridiculous set-up? Yes, though the switch is the only means I have to connect to the media converter in this case.
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Apr 24, 2012
I'm trying to configure a 2940 switch to trunk. I just can't get it to work.On the interface I have added: switchport mode trunk The default is encap for this switch is dot1q, so there is no need, or ability to add/change the encap mode. Also all vlans are being allowed by default. I still can't get any port to trunk. Need to get G0/1 to trunk, have also tried to trunk f0/6 to the switch in my office. Also can't find the command to change the management VLAN. I do not use vlan 1 for management. Can I change the Mang VLAN on this switch?
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Feb 2, 2012
I am trying to find out if its possible to use an existing CISCO 2940 Switch that we have here at our office as a hub? Im sure that borders on insane however, let me break down what we have currently and what I'd like to do.
We currently have a very nice setup here at work, with no problems whatsoever, however; we hired a new person and brought in some new printers and we are running out of wall jacks. Rather then run all new cabling and adding new outlets/faceplates etc... We were just gonna go purchase a simple Netgear 5 port switch/hub from the Local Comp store here in town. We found in our server room a what appears to fully functional and operational cisco 2940 8 Port Switch with a Gigabit port.
All IPs in the office are assigned via DHCP, so....on to the meat of my question -- I tried to plug this into our network and I can't get any connectivity out at all. All the ports light up green etc when I plug in the comps but they aren't pulling valid IPs.
I want to reset this thing and start from the ground up, I am not scared of going into the IOS and modifying what needs to be done...as long as I got a good enough walk through.
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Mar 23, 2011
I have downloaded the 90 day ISE evaluation to a vmware platform I have it successfully authenticating local user(s) onto a Cisco 2940 device (12.1) IOS I am trying to follow a TrustSEC design guide [URL] but my LAB 2940 does not support many of the commands shown in this document What I want to try to do is be able to familiarise and demonstrate in the lab the use of ISE to control access to the network using 802.1X and or VPN access from remote vpn clients?
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Feb 15, 2012
I have a broadband ADSL modem and the internet is connected to the computer yet it is not registering with the macbook book. It says that the internet is connected but as soon as I go onto Safari, it says the internet is not connected.I urgently need internet on my macbook!
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Aug 4, 2012
I I'm trying to connect to starbucks wi-fi with my Mac book but it says it's impossible to connect.
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Apr 22, 2011
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Dec 13, 2011
how to share my pc's internet wireless connection with my macbook pro in order to get the mac online. The pc is an hp wireless laptop, the router/modem is a cisco.do I just connect the macbook through the router.
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Feb 23, 2013
Does the Apple MacBook Air MD224LL/A have an integrated wireless network (Airport or otherwise) that will enable it to connect to the internet, even though the specs do not mention Airport?
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Sep 17, 2011
My MacBook works fine with my linksys router and RR internet. My wife's toshiba laptop running vista establishes a connection, but will not browse the net. My neighbor says she's having the same problem with her PC when trying to connect to my router (we live very close together).
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Aug 30, 2012
I can not connect my new Mac Book Pro to Verizon wireless. I have no trouble connecting my old Mac to it, so what is the problem with the new Mac. I have to use the ethernet wire which is a problem when I am so use to wireless.
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Feb 15, 2011
just today my macbook won't sign onto the internet wirelessly even though there are two other computers in this house that can...
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Mar 7, 2013
My Network is gone from my list of available networks on my MacBook. I use s NETGEAR router, my network name is simply "NETGEAR" i have never named it anything else since installing this over 4 years ago. I have unplugged the power cord, waiting several minutes before plugging it back in. Also tried unplugging both the cable and the power cord. The router has no small "pin hole" that i can see in order for me to try to re-set it this way. It has literally disappeared from my Mac. Do i need to re-install using my NETGEAR cd?
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Feb 9, 2013
is it possible to set up communication between my desktop Windows 7 machine and my MacBook Pro so that I can access files stored on my windows pc via my Mac?I have most of my music/movies stored on the desktop and want to be able to access them around the house on my mac.Tried searching for a way with no luck,I vaguely remember having had a connection set up automatically when I had a windows 8 laptop, so I would imagine its possible to do this.
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Oct 7, 2012
I have an RV180W Wireless-N with firmware# 1.0.1.9 The problem is that any Macintosh computer will not work with the wireless network.The problem is consistent with several MacBook laptops, running Leopard, Snow Leopard and Mountain Lion.The MacBook connects with the wireless network and obtains an IP address.However when the MacBook tries to access a web page, it fails loads.Accessing LAN assets like network volumes and printers works fine.All mobile devices, such as iPhones, iPods and iPads work fine.I have tried numerous wireless settings on the router and the MacBooks and nothing works.The problem happens regardless of what kind of wireless security is present.There is not MAC filter.
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May 8, 2013
After some wireshark, I see that when I have a vLan on the switch, only win7 gets IP, my macbook doesn't, sniffing to the bootp, I see that the DHCP sends NAK and after I only have DISCOVER & OFFER...
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Oct 9, 2011
I am trying to connect macbook air with cisco 1100 access point,but it is not connecting.
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Jan 22, 2011
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Feb 25, 2011
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Apr 23, 2011
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Apr 1, 2013
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