Cisco Switching/Routing :: 1721 - Vlan1 Cannot Go To Internet
May 12, 2013
router 1721 with one wic-1adsl ,i have adsl conection with irb static ip. the router connect with mannaged switch through a trunk port. the switch has 2 vlans one for the static IPs and the other for private lan. i need the private lan to be able to go to internet. vlan2 can go to internet because it has the same subnet with provider but vlan 1 canot go internet, so how i can make all vlans go internet(the router has only 1 fastethernet port)
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May 17, 2012
I can ping [URL], from the router but not from a client attached to the router dhcp interface(10.1.3.1). When I turn on ip routing I cannot ping at all. Here is the config I have now that can ping the internet from the router.
sh runBuilding configuration... Current configuration : 1191 bytes!! No configuration change since last restart!version 12.3no service timestamps debug uptimeservice timestamps log datetime msecno service password-encryption!hostname
[code]....
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Jan 16, 2012
I have a problem where only the 2950's switches go transperant. They drop VLAN1 thus no CDP snmp packets. The users keep working fine but our NMS center keeps calling me at 3am when this happens.
These are access switches that connect to stacked 3750's. Some of the uplinks are using media converters that i have been trying to get removed. But i doubt that it could be the cause of the vlan1 going down.
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Jan 28, 2013
if i have this config:
switch port mode trunk
trunk aloved vlan 50
will travel over this trunk untagged packets? For eg the V LAN 1 is by default native V LAN without tag. If i have created a bog ring with catalyst 3560x switches with no spanning tree on V LAN 1 can be the case of this config a loop ???
I am using upper config on interfaces that are connected the switches together in ring.
Other interfaces on switch have this config:
int range 0/1-4
switchport mode acc
switchport acc vlan1
int range 0/5-24
switchport mode acc
switchport acc vlan50
I am using vlan1 just for local switching without connection to internet! I am asking just because i have this king of messages in logs:
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet1/0/27 (1), with SW3560x_BR8874 GigabitEthernet1/0/19 (50).
GI 1/0/27 and GI 1/0/19 have this config:
switchport mode trunk
trunk aloved vlan 50
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Apr 1, 2013
I have two locations DC and Corp connected to each other via Point to Point Circuit. I have forced the two core switches setup as GLBP pair to be primary and secondary for certain VLAN's including VLAN1.I have a switch in our Corporate office 3750 which is where the point to point circuit terminates. VLAN1 SVI is manually shut on that switch. Also the priority on VLAN1 is increased manually like this, "spanning-tree vlan 1 priority 28672".
Now the issue is that the Primarey Root Bridge in the DC is the root bridge for VLAN 1. But this other switch 3750 in our corporate office also is a root bridge for VLAN1. [code]
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Jun 10, 2013
Is there any way to have my Cisco 877W Router alter from using one static route to another static route when another router on the network is reporting destination host unreachable?
Router 1 (192.168.2.253)
Dialer0 -> ppoe to internet
Vlan1 -> local 192.168.2.0/24
Router 2 (192.168.2.254)
Dialer0 -> ppoe to managed VPN (172.16.28.1)
Vlan1 -> local 192.168.2.0/24
Router 2 is connected to another network through a managed VPN and that network also has internet access. I want to be able to have two routes to the internet on Router 2. And when Router 1 internet goes down packets get routed through the VPN instead.
I currently have on Router 2
ip route 0.0.0.0 0.0.0.0 192.168.2.253
ip route 10.0.0.0 255.255.255.0 Dialer0
ip route 0.0.0.0 0.0.0.0 172.16.28.5 250
Which does nothing when Router 1 has its Dialer0 interface shutdown, or goes offline completely.I suspect I could reverse the setup and have everything routed through the VPN by default and then if / when Dialer0 interface goes down it would switch to using Router 2, but if the problem is in the remote network and interface Dialer0 stays up, it would probably do the same thing... nothing.All devices mentioned are Cisco 877W routers with ADSL and a bunch of fast ethernet interfaces.
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Dec 12, 2011
I have a 1721 router installed with both an adsl wic and a 4 port switch wic card. My setup is as follows:
pc connected to port 3 (mode access on vlan 20) on the 4 port switch wic (installed in 1721 router)port 4 is configured as trunk (encap dot1q) and connected to fasethernet 0 (inbuild of 1721)fastethernet 0 configured with no ip address?
created sub-interface fastethernet 0.20 with encapsulation dot1q on vlan 20?ip address of sub interface 0.20 is 192.168.20.240?pc nic ip address is 192.168.20.245 however cannot ping 20.240?I want to use only this router with its switch wic for vlans and internet?
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Mar 11, 2012
I started to set up a 1721 router with WIC-4ESW. This is on an internal network, so only looking to just do routing from FA/0's interface to the networks attached to ports on the WIC. I first assigned just VLANs to 2 of the ports and this did not work. So I did some reading up and decided to use bridge groups. Except I still can not access the interfaces on the WIC. And by that I mean on the router itself I can not ping the ip assigned to the BVI.
I have another 1721 w/4 port that long ago I seem to remember simply assigning VLANs to the interfaces and I was able to communicate between the networks without issue (or maybe I just don't rememer that well). Thing is I should be able to at least ping the internal interfaces shouldn't I (assuming the status is up). I don't know why BVI2 and 3 are listed as down, nor do I seem to know how to bring these up.
This is what ip int br gives me:
1721#sh ip int br
Interface IP-Address OK? Method Status Protocol
BVI2 192.168.101.1 YES manual down down
[Code]....
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Sep 14, 2012
I have set up a couple of vlans on a cisco 1721 router 4esw card using the vlan database and assigning an ip address of 192.168.1.x and 192.168.2.x for each vlan interface.Strangely enough connected computers can talk to the other vlan and I have not set any subinterfaces on the etherner0 (layer 3) and not even connected a cable.Is there any reason why this should happen since they should not talk to eachother being on seperate vlans.Doing a tracert shows that first the vlan ip address is hit and then straight to the target pc in the other vlan?
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Oct 20, 2011
Long time since I have had to configure a router and have a small project
Here is what I have in a simple diagram:
PC(static IP)--to--Switch--to--(Ethernet0 int, WIC0)1721 router(FastEthernet0 int, built-in)--to--Switch--to--PC(DHCP)
I need static IP PC to be able to ping the DHCP client. Static IP units 10.1.1.x/16, DHCP clients 10.1.3.x/16.
I have found these overlap and thus give errors and will even shutdown the interface if I enable certain things like routing or bridging.
So I gather I need to change one interface IP range, which would be the DHCP side, I need to stay 10.1.1.x/16 for static side.
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Jan 26, 2012
enable dot1q encapsulation on two ethernet ports on a 1721 router. I am able to configure it on the built in fastethernet port, but not on any interface provided by a WIC-1ENET or a WIC-4ESW. I have an application that requires two physical ethernet ports that support dot1q encapsulation.
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Jan 1, 2013
I have a Cisco 1721 router with an ADSL wic. I have followed guides on the Cisco website so that I can connect the router to my home adsl connection. The router connects to my broadband provider and sucesfully obtains an IP address along with Dynamically assigned DNS servers. I am able to ping google.co.uk from the router but not from clients attached via DHCP.
I have noticed that if I ping the IP address of google.co.uk from a client it resolves but it will not resolve the name. This would lead me to believe that the problem lies with DNS resolution/forwarding but I do not know how to investigate further.
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Feb 22, 2012
I am working on a backup system for my WAN. Verizon quoted the HWIC-3G-CDMA-V to work with my Cisco 1721 router. I have a bunch on these routers on a shelf and thought I would use them for the 3G network. Looking at the Cisco web site it does not list the 1721 as being able to work with this HWIC. I thought it might not be listed as the 1700 series are End of life. Whether it will work?
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Jan 15, 2012
I would like to know can we configure vlans with cisco 1721 Modular Router? Is it Possible to configure lan environment with the vlans configured in 1721 router without a managed switch?
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Feb 20, 2013
I am using a bunch of Cisco 1721 routers for my T1 lines. We recently purchased Digi cell modems as a backup for the T1. On configuring vrrp to work on both devices I discovered that IOS 12.3(6c) does not support the "vrrp track" feature. After reviewing the Cisco Feature Navigator I could not see an IOS that will support the vrrp object tracking. Is that correct? The routers have T1 WIC's installed. If it does work what is the latest IOS that will work on this end of life product?
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Sep 19, 2012
My company just assumed management of a remote entity. The network has several misconfigurations and I need to make some network modifications from my office w/o losing access or incurring lengthy outage to the clients. The network consists of 1721 router and three 2960 switches.
- I only have access to the router from the Internet. I telnet off the router to the 3 switches.
The site uses a single class C 192.168.1.0 / 24. The router is running RIPv2 even though this is the only network. The prior network person (contractor) set up separate native vlans on each switch and all the ports are defined as Native trunk and access are defined to the VLAN interface assigned to the switch. So of course the logs are flooded with Native VLAN mismatch, Each 2960 switch is a VTP server but has no VTP domain.
basic network layout:
Internet => Eth [Cisco 1721] => Fa 0 192.168.1.254 ==> [SW1]
[SW1]
interface Vlan1
no ip address
no ip route-cache!interface Vlan220ip address 192.168.1.219 255.255.255.0no ip route-cache
[code]....
!interface GigabitEthernet0/1description SW2 Gi0/1switchport access vlan 204switchport trunk native vlan 204!interface GigabitEthernet0/2switchport access vlan 204switchport trunk native vlan 204!interface Vlan1no ip addressno ip route-cache!interface Vlan204ip address 192.168.1.224 255.255.255.0no ip route-cache Normally, I would assign the current 192.168.1.254 to a subinterface to Router Fe 0/0 but with each switch having its own native VLAN I am afraid I will lose connectivity to the downstream switches -- my only access is telnet off the Cisco1721 Router.
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May 13, 2012
I can access the LAN environment 10.1.1.X from 20.1.1.X but cannot get out the gateway to the internet? The linksys gatway model is a WRV54G.
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Dec 18, 2011
I have an Inspiron 1721 laptop and can no longer acces the internet unless I attach the ethernet cable from my wireless modem. In other words, I can no longer access the wireless internet from my laptop. I have talked with my internet service provider and the say the problem is the settings with the laptop itself because I can access the internet from my tablet computer.
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May 18, 2012
Second laptop attached to cisco 10mb port with an IP address of 10.18.158.200 and the cisco interface 10.18.158.254.Okay, here is what is happening and I cannot work it out.If I ping, from Laptop 1 to the cisco subinterface on 192.168.94.253 it is succesful. If I ping from the 1721 to Laptop 1 it is successful. I see the VPN come up and the rulebase on the junipers show the traffic flowing across (ICMP).If I ping, from the 10.18.158.254 interface via telnet on the 1721, I can ping all the way through to 192.168.194.254, which is the gateway for Laptop 1.
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Feb 3, 2013
I'm trying to get a catalyst going for remote management using cisco network assistant.I've basically, enabled telnet;
enable conf t line vty 0 15 password {password}
login
exit
gave it an IP;
int vlan1 ip address {IP} {Subnet}
no shutdown
exit
[code]...
and write mem to save it all. I can ping, telnet and access cisco network assistant from inside the network perfectly. But the problem I'm having is accessing it from outside, can't even ping the device. I can ssh to other servers behind the network just fine. There is no firewall in place at the moment, the provider's drop is plugged in gige port 1?
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Dec 27, 2009
In default mode the ASA 5505 is setup with two Vlan's, one inside and one outside. Vlan1 is the default inside VLan, with IP 192.168.1.1. I would like to change the subnet of Vlan1 tot 192.168.10.1, but when I do, no Ethernet port is assigned to Vlan1 anymore (was 0/1 - 0/7). What I have done is;
#config t
(config)#interface vlan 1
(config)#ip address 192.168.10.1 255.255.255.0
But after that, no Ethernet port is within Vlan1, so I tried the following to assign one (port 0/1);
#config t
(config)#interface 0/1
(config)#switchport access vlan 1
(config)#no shut
But nothing happends when monitoring (#show run) interface 0/1 (no Vlan assigned)
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Nov 13, 2012
I have the following topology:
2x 877 routers, one interface from each router (port Fa0 which belongs to the router internal switch) is connected to the 2960 switch, the switch himself configured with default settings, flat with one v LAN.
I have configured HSRP in the following manner: router A is 10.0.0.2, router B is 10.0.0.3, virtual IP is 10.0.0.1, take note that the HSRP configuration along with the IP address are configured on vlan1 interface.
Now when i connect a PC to the switch with static IP (10.0.0.4) and trying to ping 10.0.0.1 I'm not getting replies. i see on the PC, using wire shark, the icmp request goes out but on the primary router (and also on the backup) i can't see the icmp request (using debug ip icmp).
this behavior happens only when the HSRP is configured on interface vlan1, when configuring the same configuration on Fa4 (which is WAN interface) everything works fine.
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Feb 26, 2012
I have an ASA5505 where vlan1 (inside) and all associated ports (e0/1 - e0/7) are down. Workstations on vlan 1 are online and working. Vlan2 (outside) is up and running normally. I tried to shut/no shut on the vlan. I also rebooted the firewall. No change. Why vlan1 is down?? I've attached some config info and some troubleshooting.
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Apr 7, 2011
I have a problem with my Cisco 887V VDSL-router. The router gets a ip-address with dhcp from my provider. That works fine. I also can ping from the router:
routerVdslTestNew#ping google.ch source vlan 1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 74.125.79.99, timeout is 2 seconds:
Packet sent with a source address of 10.10.10.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/48/52 ms
My problem: If I want to ping google from a computer in the VLAN1 the ping doesn't work.
C:UsersXXXXXX>ping 74.125.79.99
Ping wird ausgeführt für 74.125.79.99 mit 32 Bytes Daten:
Timeout.
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May 20, 2013
I want to know how am i do to change the Vlan1`s IP address because the actual ip will be used in another vlan. Actually i haver 10 vlans in L3 mode (routing) implemented in it.
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Jun 4, 2012
Got an odd problem with trunking, all vlans except vlan1 trunk perfectly. Link is from a pair of dualhomed FEX 2248TP's to some 3650G Switches. Nexus running - version 5.1(3)N2(1) 3560's running - 12.2(53)SE2 & 15.0(1)SE2
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Nov 19, 2011
I have 2 VLANs set up and I know they are set as default to not allow one to communicate to the other. Is there a way to set a rule to allow that? I'd like VLAN1 to be able to access VLAN2, but not the other way around.
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Mar 1, 2013
I have an SG500 that is already deployed with some Access VLANs on it. The PVID is still the default 1. I am trying to change it to 19 with as little interruption as possible. If I just go to the VLAN Management Tab and change the Default VLAN to 19 and reboot the switch, will it migrate my management IP to the default VLAN without any trouble? Would it be less interruption to: Create VLAN 19, assign it an out of subnet IP address, change a port to PVID 19, connect directly to that port, go to that IP address, remove the original management IP from PVID1, change all the ports to PVID19 then change the management IP back to the original?
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Feb 21, 2012
the attached image shows what i am trying to achieve.i need to establish connectivity from subnets 10.30.5.X and 10.30.6.X (in VLAN1 and VLAN2 respectively) to subnet 10.11.35.X
i have a trunk port on my cisco 2960 that is connected to GiE0/0 on my Cisco ASA that has 2 sub-interfaces with IPs in the subnets mentioned above.my problem is i can only connect to 10.30.6.X from 10.11.35.X (and vice versa), but no connectivty to 10.30.5.X
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Sep 7, 2012
My plan is to use VLAN1 for the internal private network and VLAN2 for free public wifi. My question is can I use a PC on VLAN1 to configure/manage my access points? There are no dedicated PCs on VLAN2.
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Jun 17, 2012
It is my understanding that the FWSM for the 6500 series switches uses a 6 port Etherchannel on the backplane to communicate with the 6500 series switch.Can you shutdown vlan1 on the switch and still communicate with the FWSM? I was under the impression that you could not (although I am looking at a config with it shutdown)
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Apr 8, 2013
I have a customer with several SG300's providing VLAN1 for data and VLAN10 for voice. The PC's are piggy backing off the phones and showing up in the SG300 fine:
One department has recently employed more people so we have an SG200 switch to connect the computers and phones to. I don't seem to be able to get any connectivity between the new switch and the SG300 it is connecting to. I have setup VLAN1 and 10 as per the images below:
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Nov 19, 2012
configuring VPN in my cisco 1721 router to connect in vpn client
I have the public IPs.
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