Cisco WAN :: 1841 ISR Sub-interface With VLAN Tagged
Dec 7, 2010
I am trying to roll out a new internet router. The problem I am faced with is the LEC only supports VLAN 1227 and greater, specifically they are assigning me VLAN 2528. I am able to create the sub-interface and setup dot1q encapsulation for VLAN 2528, but the vlan database does not have the ability to add VLAN 2528 to it so I am unable to get layer 2 up and going, thus preventing me from getting the implementation done.
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Jan 3, 2013
we've to configure our router 1841 to use both 2 interface Fe for two different vlan (also the second has to go on internet).
Actually we have int Fe0/0 configured with an ip address 192.168.1.1 for lan1 192.168.1.0/24 and we will use the second int Fe0/1 with another ip address like 192.168.2.1 for lan2 192.168.2.0/24.
see below configuration:
[code]...
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Feb 12, 2012
I have a sf300 with (2) vlans (1) ] vlan for data and vlan (100) is my voice vlan I have Vlan (100) tagged traffic, and my VoIP pbx as an access port only to vlan (100) all other ports are trunk ports with vlan (100) tagged and vlan (1) untagged traffic. I get no outbound audio on calls I can call out hear them fine they cant hear me. I am wondering if my tagged traffic leaving the phone is being striped and if so were. I have CDP turned off.
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Dec 7, 2011
i have a Catalyst 2960S since 2 days. I am a new user, i like to configure the switch! my first problem is: i have 2 v LAN vlan1/24 and vlan200/24. I'd like to config port1 to be tagged on the 2 v LAN i know from hp port must be tagged. how can i config port 1 to be tagged on vlan1 and vlan200? and port 2 to be untagged in vlan1 and untagged in vlan200?
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Dec 14, 2011
We have a Cisco Aironet 1130AG Wireless AP (firmware 12.4) and have a guest wireless network (internet only) and corporate wireless network configured on it. They are kept separate by having different VLANs assigned to them. When a laptop connects to the guest network I see the DHCP request go out and it is tagged with the correct VLAN. The problem is when a laptop connects to the corporate network I see the DHCP request go out but there is no VLAN tagged on the packets. This causes a problem because both of our DHCP servers (on VLAN 1 and 3, remote DHCP servers no DHCP running on the Aironet [Doesn't seem like this version has a DHCP server]) are sending responses and sometimes the corporate user will get an IP address on the Guest subnet.
Our corporate network is setup on VLAN 1 which is configured as the Native VLAN on the Aironet. Will this cause the Aironet not to tag these packets with any VLAN information? Any other thoughts as to why it isn’t tagging these packets to a VLAN?
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Mar 6, 2012
We are trying to setup a WAP4410N with 2 SSID's. One SSID for our private network and the other for guest internet access. On the VLAN and QoS page there is a setting for priority. What would be the suggested values for this setting? We obviously want our private network to receive priority over our guest network.Also, does VLAN Tag setting need to be on Tagged to determine private from guest traffic?
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May 9, 2012
i have a 1841 cisco router and i recently purchased a 1 port HWIC wan interface card. My problem is that I cannot see the interface in my config file. Is there something i am missing?
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Nov 21, 2012
i'm going mad on following problem. I'm trying to get 2 networks seeing each other while one of the network is a non VLAN network and the other one is a VLAN network.They should use the same interface so i added VLAN e0/0.122 to the interface e0/0.Send a ping from my asa to both gw-IP's made me happy at first. In second in figured out that i cannot reach any client in the other network. For testing purpose i created an permit acl to any/any for both networks, but the packets still get dropped by the default implicit rule. (deny any/anyMaybe i'm to stupid for this
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Feb 27, 2012
I am trying to figure out how to use a Cisco 1841 IOS router to take traffic from one interface and source NAT it out towards the Internet on one interface and at the same time NOT perform NAT when sending the traffic towards a different routed interface.
Here the RemoteSite has connectivity back to the MainCampus, but there is no need to NAT traffic from the one site to the other. They share the same umbrella of address space. However, the RemoteSite needs to have its Internet-bound traffic NAT'ed out to the Public Internet via a third interface. I know that I could just NAT everything out from the Remote Site and map the traffic back onto the same address space for intra-campus communication, but I'd rather avoid that and just NAT where I need to NAT it to the Internet.
I do have a caveat here: in the event that either the MainCampus or the Public Internet interfaces go down, I would like to failover traffic from the downed link to other good link. For example, I want to NAT all traffic (including "intra-campus" traffic) out via the Public Internet if the direct link to the MainCampus is down. For the other example, if the Public Internet direct link is down, I would just send out all traffic without NAT towards the MainCampus.
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Aug 17, 2011
I have found this workable cisco 1841 config on the NET. From this link: [URL]
But it is doing source NAT from FA0/1 to Fa0/0. If we need to bridge, is it need to use “ip unnumbered”?
See my config below” 1841 config for Unifi, with ip unnumbered“, can work?
1841 config for Unifi, with NAT
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! !
! Works perfectly on Cisco 1841, IOS v12.4(24)T !
[Code]....
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May 2, 2013
I am trying to config the following setup in the Cisco 1841. Able to ping the IPs of Vlan1(FE0/0/1), Vlan2 (FE0/0/1) and FE0/1 IPs from corresponding networks. But packets are not flowing to other side.
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Apr 10, 2011
i am having 2 locations & having cisco 1841 & 2821 at both the end connected via a P2P link. Now when i trace location A from location B, the traffic is getting dropped at location A's Vlan HSRP IP address.there is no ACL in that Vlan, but still it is getting dropped.
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Nov 4, 2011
I use an 1841 router as an internet facing firewall with a 10MB MetroE connection. Lately users started reporting slow internet download speeds and web pages timing out. Bandwidth reports do not show the link as being saturated so I looked at the interfaces on the 1841. The interface connected to the provider shows OK as far as errors but the LAN side of the router shows steadily increasing input errors. It doesn't show any other errors, no CRC, frame, runts, giants or overruns, just generic input errors. What type of errors are those? Nothing is being logged on the console.
I moved the connection to another switch ports and the errors continue. I switched it down to 10MB and also changed the switch and the errors slow down but don't stop. Interestingly, the switch side never shows any errors. What can I do here? I guess it can be a bad interface but that is such a rare thing that I am hesitant to replace the router.
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Jul 15, 2012
I'm trying to troubleshoot one of our site today and can't seem to issue the show dsl interface command on a 1841 router. Does the same command is used for SHDSL or am I running with an IOS bug?
#sh dsl?
% Unrecognized command
#sh ver
Cisco IOS Software, 1841 Software (C1841-BROADBAND-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)
Technical Support: {URL}
Compiled Wed 13-Aug-08 15:42 by prod_rel_team
#sh inv
NAME: "chassis", DESCR: "1841 chassis"
PID: CISCO1841 , VID: V05 , SN: FHK13212639
NAME: "WIC/HWIC 0", DESCR: "WAN Interface Card - ATM (With multi line G.SHDSL module)"
PID: WIC-1SHDSL-V3 , VID: V02 , SN: FOC132041KD
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Jan 13, 2013
I have a cisco 1841, Im trying to write an app which will get the Interface Utilization on my 2 atm interfaces and fast eth 0/0 interface.
I’ve been reading up and have got as far as downloading the codeplex snmp library project. I’m using the snmpget app to get details off my 1841 successfully, but I now need to know the OID for interface utilization and how to define which interface to get.
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Dec 22, 2010
I have a problem in my Cisco 1841 in Virtual-Access Interface all interfaces is UP Except Virtual Access is Down . [code]
when i want recover the virtual access to up ,should i do shut & no shut to the ATM interface.What is the cause of the problem, and how I can solve this issue?
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Oct 31, 2012
i have router 1841 have 2 interface.i make routing between vlan by subinterface in router and in switch trunk but vlan 5 cannot access internet
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Feb 11, 2013
I have an 1841 between my firewall and the ISP. Three interfaces - multilink to ISP, FA to my firewall, and FA to my inside network. I use the inside interface for configs aand snmp access, etc. Only my ISP-assigned fixed address block will get routed to the multilink by the ISP but I am nervous about the inside interface sitting on my LAN. I know I can remove it, but if I keep it there, how can I set up an ACL so that all traffic from the multilink interface is denied to the inside interface? I suppose another way to think about it that the inbound iface can only accept traffic from its own outside, not from the router.I think this is fairly simple but I don't want to knock down the traffic if I get it wrong.
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Jul 2, 2012
We have an ADSL2+ line from a WIC in a 1841, everything has been fine for the last few years and then the last few months the connection going down. When checking the interfaces the ATM0/0/0 is up up and the same for the dialer interface we are using, they are both up/up, but this still needs a reload of the router to be functional again, shutting the interfaces does not bring the connection back up.
I am not an expert on ADSL lines, I have never really had a problem with anything previously. The router was running Netflow to a network monitor wondering if this or logging was causing an issue with entries in the buffer??
Here is an output of show dsl int, would change the firmware, it has been fine all this time before though we are running IOS 12.4(24)T1 advseck9-m, as far as I can seen from our ISP the config for ADSL is all correct. [Code]
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Mar 6, 2012
I see people configure HP Switch using command like "tagged and untagged". Example: vlan 10 tagged 5. I don't really see this command on Cisco Switch. What does they mean?
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Dec 19, 2010
We want to terminate new 10M link via Ethernet interface on Cisco 1841 router. We have free Gig port on the router. We also have HWIC-FE module inserted in the router. However, our implementation team said that Cisco 1841 doesn't support 10M link. It is not designed to cater to such high Bandwidth.
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Dec 21, 2010
What are the possible effects of assigning an invalid address like 172.22.0.0 255.255.255.252 to a router interface. The 1841 router accepted the address?
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Apr 29, 2012
I am trying to use the connected WIC2-2MFT, as the servial interface on my cisco 1841.But it does not show me the option, under configuration interface
[code] What should I do to make this enable on this list?I am attaching the show tech-support, and show version of this device.
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Feb 18, 2013
We are using Cisco Router 1841 and users reporting issue related to VoIP. After investigation, seeing input errors on Router LAN interface, but there is no error on connected switch interface. [code]
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Nov 14, 2011
We have a 1841 Cisco router for one of our remote sites and we have the GRE over IPSec tunnel on it (with our datacenter router) for the connectivity. The LAN facing interface becomes UP/Down (status 'UP', Protocol 'Down'). When I login the router and 'shut' and then 'no shut' the interface, the interface becomes UP and everything starts to work. Traffic starts to flow across it. But after some time, some hours or sometimes some days, the interface is again back to up/down status. The router is connected to a non-Cisco switch. I do see some CRC's increasing very slowly, but apart from that there seems nothing wrong with the interface in sho int fas0/0 command:
!
RTR01#sho int fas0/0
FastEthernet0/0 is up, line protocol is down
Hardware is Gt96k FE, address is 0026.cb91.ee48 (bia 0026.cb91.ee48)
[Code]....
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Oct 22, 2012
While I managed to connect to each router individually, I decided it was time to connect the routers together via serial; as I don't have any serial cables and need to buy some, what serial cables I need, as well as to ask whether I have the right cards in my router(s) that will allow me to do so.
I bought 3 1841 routers, and all have a 1 port serial WAN Interface Card (WIC 1-T); one router has 2 of these, and one router has a WIC-1B-S/T .. My question is, can I connect the routers with a serial cable via WIC 1-T, or do I need a 2-T
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Feb 2, 2011
why my input parameter are gone in the TAGGED website ?
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Jun 5, 2011
my office is looking in ordering a HWIC-1FE to supply our cisco 1841 router with a second ISP connection. i wanted to find out if this card support load balancing and fail over? not sure if fail over is the right terminology so ill explain, i need it so that if one ISP connection goes down (as it does often) it fails over to the second ISP.
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Jun 21, 2012
I am planning to use a pair of Catalyst 3750 for QinQ over a L2 link (lan extension)
We neeed to have control over what vlans we propagate over this link and we want to avoid incuring costs for every aditional vlan we might need to add to the trunk that would connect to the QinQ provider switches
Our workaround for this would be to ask the provider to give us an end to end vlan that supports MTU-1504B (QinQ frame size) and connect our switches to this.
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Dec 18, 2011
I have Cisco router 851 at my region site. It has five Fa ports. One of them is connected to ISP and has ip address 10.1.1.2 (for example). It also has vlan 1 interface, that has ip address 192.168.0.1 (also for example). I also have Tun0 interface that goes through ISP network and connects to my hub network. The rest of Fa interfaces are swithcable and they are in vlan 1.The problem is that from hub LAN I can telnet to 10.1.1.2 ip address, but I can't telnet to 192.168.0.1. Whereas I can Ping 192.168.0.1 from my hub LAN.
Topology:
Hub LAN -------ISP---------Spoke Router 851
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Jan 12, 2013
How to apply access list on Vlans ?
my Scenario is
13 Vlans in cisco 3560 switch (Vlan 10,20,30........ 130)
vlan 10 ---- ip range 192.168.10.0/24 interface vlan 10 ip add : 192.168.10.1
vlan 20 ---- ip range 192.168.20.0/24 interface vlan 20 ip add : 192.168.20.1
here i want to block vlan 10 access to vlan 20 i created extended access list deny ip 192.168.10.0 0.0.0.255 192.168.20.0 0.0.0.255
and applied in interface vlan 10 as out now i cant able to access any host in vlan 20 (host 192.168.20.1) but i can able ping vlan 20's gateway 192.168.20.1
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Mar 19, 2012
i have linksys modem which already working for different v lans then for lab we take other switch 3750 switch and created different v lans. v lans are working fine but we need internet for different v lans for that linksys modem how we can make interface V lan1/
ip address 10.1.1.10 255.255.255.0
ip default- gateway 10.1.1.1
no sh
interface Vlan10
ip address 10.1.2.1 255.255.255.0
no ip route-cache
!!interface Vlan20
ip address 10.1.3.1 255.255.255.0
ip route 0.0.0.0 0.0.0.0 10.1.1.1
ip dhcp pool vlan10
network 10.1.2.0 255.255.255.0
default-router 10.1.2.1
dns-server 10.1.1.1
!
!ip dhcp pool vlan20 network 10.1.3.0 255.255.255.0 default-router 10.1.3.1 dns-server 10.1.1.1
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Apr 22, 2013
Actually I am new to this ASR , in my environment my 6513 is connected ASR , I want to know how can we access and configure VLAN on Gigabit interface which is connected to 6513.
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