Ip Addressing Class B And C?

Oct 31, 2011

can i use both class B and class C at the same time?If so, what should i do with class B? and with the other Class C?i got 500 computer into 5 segments

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IP Addressing In Class C?

Mar 4, 2012

I need to provide logical addressing this network using class C but I have been given no address to start with, only the network diagram:


How do I even start this? How do I know which address to use?

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Cisco Routers :: RV082 IP Addressing Class B

May 27, 2013

I read in the RV082 user manual can I configure a Ip address class C in the LAN interfaces.I need to know if the router support a class B addressing.

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Cisco Firewall :: ASA 8.4.3 Class C IP Addressing / Routing Subnet Design

Sep 25, 2012

I am carving up an internet Class C for customer. This class C is used by 3 distinct QA, Corporate and Production firewalls. I want to carve up IP space so there is a /26 for each environment. The issue I have is the firewalls may need communication with each other via the public IP space. Currently I don’t have any L3 switches in between the firewalls and the edge internet router. So with subnetting, it would seem I need to push everything through the internet router for the intra-firewall communication.I would rather not push this traffic through the edge router, so I came up with an idea to allocate all firewall outside interface IP’s in the 4th (last remaining) /26. That way, I can allow firewalls to communicate over the primary interface IP’s, which will all be in the same subnet – without going through a routing “engine”/device.
For the actual environment subnets (NAT's on respective firewalls), I create a static route on the edge router pointing to each of the firewall’s primary IP’s for the respective environment routes (the first 3 - /26’s).This is still a beta design, but I have done this before on small scale when ISP gave me 2 subnets for example, assuming I was going to put a router in between the customer firewall and ISP. I would use the “routed subnet” on the ASA interface, and then pull the NAT’s from the other subnet. The ISP would have to add a static route directing the NAT subnet to the “routed subnet” correct IP - which would be the firewall outside interface primary IP.I recently found out that with ASA OS 8.4.3 and up, ASA will not proxy arp for IP’s not in its local interface subnet. This means the ISP/router will have to assign static ARP entries on the edge router. This can get messy after the first few NAT entries. So I am debating the design now. I think this kind of stuff going forward won’t be worthwhile with newer ASA 8.4.3 code.

How to communicate between different ASA’s, while still carving up the Class C into usable smaller subnets? The primary reason for doing this in the first place is to support routing on the edge router. I am thinking it might be time to ask for another Class C to do the routing functions, and keep the firewalls all at Layer 2 in one /24 - Class C?

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Cisco :: Switch IP Addressing

Jan 2, 2013

I'm on my way of taking the CCNA Exploration, and even though I haven't got to the LAN Switching and Wireless course, one question does bug me. In your average LAN, does your average switch has an ip address, or is it a 'dumb' device like a repeater ? Is the same true for layer 2 switches and layer 3 switches or is there a difference in terms of IP addressing ? Can you even assign an IP address to a switch ? Would you want to do that and why ?

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IBM T23 Laptop / Private Ip Addressing?

May 8, 2011

I have a IBM T23 laptop that I have reformatted and am trying to log onto my wireless internet via a linksys pcmcia card which When I try to connect it tells me I have private IP address and I am not sure how I can reconfig so that I can connect via my router to the internet.

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Cisco WAN :: ASA / 2911 / PBR And IP Addressing?

Jan 28, 2011

I am looking at this doc to use an ASA + 2911 to do Policy Based Routing with multiple ISPs.From the linked doc, under the PBR scenario, what should the IP addresses be for the routers connection to the ISPs?  It isnt labeled.

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Creating An IP Addressing Scheme For Each Subnet?

Jan 30, 2012

I have been assigned to create a basic IP Addressing Scheme. The company has a single class B private address range of and it needs to be divided into four subnets. They are all based on a single router.

Subnet A: 500 hosts
Subnet B: 200 hosts
Subnet C: 50 hosts
Subnet D: 20 hosts

How can I subnet them correctly and how would I make an addressing scheme for each subnet? (Host range, server, peripherals, gateway address? etc.)

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Cisco Wireless :: Keep Getting DHCP Timeouts 169.254.x.x Addressing?

Jan 17, 2012

Keep getting DHCP timeouts 169.254.x.x addressing.  I think that the client laptop is not giving a response to the REQ from the DHCP server.  Am I correct in my interpretation of the debug?
00:21:d7:93:f9:40 from Disassociated to Idle
 *apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 DHCP_REQD (7) Deleted mobile LWAPP rule on AP [00:21:d7:93:f9:40]
*apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 Username entry deleted for mobile
*apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 apfMs1xStateDec
*apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 Deleting mobile on AP 00:21:d7:93:f9:40(0)
*DHCP Proxy DTL Recv Task: Jan 18 13:48:37.073: 58:94:6b:d0:41:08 DHCP received op BOOTREQUEST (1) (len 308,vlan 0, port 29, encap 0xec03)
*DHCP Proxy DTL Recv Task: Jan 18 13:48:37.073: 58:94:6b:d0:41:08 DHCP processing DHCP DISCOVER (1)


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Cisco Routers :: RVS4000 Has No DHCP Addressing

Oct 25, 2011

I have a customer using a RVS4000, DHCP is enabled; the unit is set as gateway but there are no DHCP address assingments coming from the router.

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Protocols / Routing :: Ns2 Error When Running Hierarchical Addressing In Tcl

Jul 28, 2012

i have used hierarchical addressing in my tcl program. when i run the code, it produces the error, str2addr:Address 146672855 outside range of address field length 1024. what's his error?

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Cisco Wireless :: WLC 5508 Interface Addressing - Limitations?

Aug 26, 2012

Is there any limitations of network size for an interface in a WLC 5508? Any recomendations of netmask size? Maximum /24, maximun /21?

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Cisco Firewall :: ASA5540 Management Interface IP Addressing?

May 9, 2011

How does one allow /31 mask for an management interface on an ASA5540 using version 8.3(1)?
I need to configure a 192.168.x.y /31 on the management 0/0 interface of a ASA5540 and it is providing me with the following error:ERROR: /31 mask is not allowed

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Cisco Firewall :: ASA 5520 Active / Standby Failover - IP Addressing?

Mar 15, 2011

I am getting ready to setup avtice/standby failover on our ASA 5520's and have run in to an issue.I currently only have one External IP address available. My Idea was to use a private/placeholder IP address for the standby external IP Address, will this cause any issues with the failover? I know I won't be able to access the secondary from the outside, but that is not an issue.

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Cisco Routers :: How To Enable Addressing Ipv6 In Router Linksys EA4500

Jun 4, 2012

how can enable addressing ipv6 in router linksys EA4500? I need access on the terminal of router?

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Class A IP's On C Network

Dec 28, 2012

I've noticed a Class A IP address on our Class C network. What does this mean and how can I determine what's causing this? I've can ping and tracert which gives and The DHCP Scope on the DC is - 3.200.

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Subnetting A Class C Ip Address?

Dec 13, 2011

I am looking a old exercise I did last year about subnetting and I am wondering if is possible to subnet: /22

I wrote down, last year, that:

16 bit are assigned to network
6 to subnet
10 to hosts

when actually I see a class C ip address with 10 bit assigned to hosts. So, how many bit do I have for network, subnet and hosts?

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Configure Two Class Network On One Router?

Apr 6, 2011

i want with mask class network to communicate with with mask to have the same gateway

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Why Do Class D Doesn't Have Subnet Mask

Apr 27, 2011

why do class D doesn't have subnetmask

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Cisco WAN :: Why 857 Adv Security Don't Have Class And Policy Map

Feb 1, 2012

Why my 857 adv security don't have class-map and policy map command ? now i wanna use traffic shaping on this but when i use command class-map it doesn't have. [code]

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Routers / Switches :: How To Subnet A Class B IP Address

Jan 16, 2011

how to subnet a class B IP address?I have a homework, I don't know how to subnet a class B.

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Cisco WAN :: 851W Won't Accept Class-map Command

Feb 1, 2011

I am trying to configure QoS on my Cisco 851w router using the class-map command.However it won't accept the class-map command.The router is running cisco IOS version 12.4(15)T10 "C850-advsecurityk9-mz.124-15.T10.bin".

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Cisco WAN :: Class Based Qos Monitoring On 6509

Mar 8, 2011

I set globally the QOS on my infrastructure and I want to monitor graphically the usage of each classes.I'd like to do that on my COREs Switchs which are Catalyst C6509.I can achieve that in command line, but it's not user friendly and it's not possible to have daily/hourly graphs.
So the idea is to find the value in the MIBS and put it in MRTG graphs.The only problem is that I cannot find it in the MIBS.

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Cisco WAN :: Psuedowire-class Command On 2821?

Jul 27, 2011

I have tried multiple IOS for the 2821, including service provider, and advanced enterprise, and none of them have the pseudowire-class command.I have compared the features to the ones that do have the pseudowire-class command on the 6500 series and cannot figure out what I am missing.Is that command not supported on the 2821?

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Cisco WAN :: 7206vxr - Class Based Shaping

Jun 3, 2013

There around 70 remote sites and head end is of 200 Mbps MPLS WAN link..
Platform: 7206VXR, IOS: 12.4(15)T7
The QOS configuration at present is attached..
At the head end, we would like to shape based on remote sites bandwidth. Having said that, how many classes should I create to achieve this? Is there any other simplified way of achieving this ? 
Remote Site MPLS bandwidth
No. of remote sites
64 kbps
128 kbps

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Cisco Application :: ACE 4710 Class Maps - IF And OR Logic

Aug 21, 2012

I'm currently looking at doing some re-design work for a platform we manage on the ACE.I want to be able to run a single VIP and only do a sticky session based around specific URL's not all. I've got the following configuration to apply a sticky session to a URL. [code]Notice, under the Policy-map type loadbalance http first-match WEB-POLICY-L7 i have two class statements, one that matches the URL L7 policy and applies a sticky farm and the second class falls into the default.Am i right in saying with this configuration, any http traffic hitting the VIP that does NOT match /urltobedefined.co.uk/test sticky sessions are NOT applied. But traffic hitting that does match /urltobedefined.co.uk/test will apply the sticky policy?   

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Cisco Firewall :: No Class Inspection Default On 5505?

May 9, 2012

I was under the impression that all Cisco ASA firewalls shipped with a default inspection policy.
policy-map global_policy
class inspection_default
inspect dns preset_dns_map

can I build this myself? Why is it missing (I have two other ASA 5505s here that also do not have it). What would I do to rebuild it?

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Cisco Firewall :: 2851 HTTPS URL Blocking Using Class Map

Aug 3, 2011

I have a request for blocking urls using a class map. I have made this work with HTTP, however it does not work for https. This is a 2851 router with IOS Version 12.4(15)T7. I see i could use the command "match protocol secure-https" however this does not let me specify any specific urls.
Does a new IOS version will support what I'm trying to do? Or if there is another way?

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Cisco Firewall :: 871 - Default Class Map Is Dropping All Packets

Aug 21, 2012

I have a Cisco 871 router that used to have Access list based security. now I am trying the ZBFW for the first time.  I thought I had a pretty good program until I found all my traffic was getting dropped. This is my first stab at ZBFWs and I am a bit confused esp with the default class part.
The router is for my house and thus also has to have priority for gaming. I will add the gaming and voice QOS once I get it working,
Guest VLAN has access to 2 IP's in Data for printing. Cisco871#sh run

Building configuration...
Current configuration : 8005 bytes
version 12.4
no service pad


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Cisco Firewall :: 881W - Purpose And Logic Behind Consolidating First Class-map?

Jul 23, 2011

I really need understanding some of the logic behind the default ZBFW settings on my Cisco 881W courtesy of Cisco Configuration Professional.  Here are my two questions:
1.)  What is the purpose and logic behind consolidating the first class-map (ccp-cls-insp-traffic) in to the second Class-Map (ccp-insp-traffic) as follows?
Code ....

2.) What is the purpose and logic of Policy-Map ccp-inspect is trying to drop traffic from ccp-invalid-src, which is filtering based on ACL 100:

policy-map type inspect ccp-inspectclass type inspect ccp-invalid-src drop logclass type inspect ccp-insp-traffic inspectclass type inspect ccp-protocol-httpclass class-default drop.

Code ....

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Cisco Switching/Routing :: 3560CG Shows 0 Traffic In Class-map?

Apr 10, 2012

I tried to put QoS in a  WS-C3560CG-8TC-S  version 12.2(55)EX2.It shows 0 traffic in class-map. Here is the config My question is why I can not see the traffic via class-map?it should in the default Q if incorrect mark.I erased the config and config with the autoQoS, shows the same result. 

class-map match-any VoIP  description Voice IP Phone RTPmatch access-group 157
class-map match-any WEB  description Internal Web, SSL Web, DNS query, Pinnaclematch access-group 153
policy-map QOSMARK
class VoIP  set dscp ef 
class WEB  set dscp cs3 
class class-default  set dscp default


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Cisco AAA/Identity/Nac :: ACS 5.3 Suppress Radius Class / CACS Attribute

May 13, 2013

ACS 5.3 always sends the class=cacs:xyz attribute in an authentication response. How can I suppress that behaviour? The Cisco Email Security Appliance doesn't support multiple class attributes (defect 49096) and even treats  guest users as administrators.

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Cisco Switching/Routing :: 2960s PoE Port Class Detection?

Aug 28, 2012

Connecting Avaya 9611G  IEEE class 1 devices to a Cat2960s.  How ever some of the phone are registering as class 3 devices no matter what interface the phone is connected to. Typical port config is as follows:
interface GigabitEthernet1/0/2
switchport access vlan 25
switchport mode access
switchport nonegotiate
switchport voice vlan 22
srr-queue bandwidth share 1 30 35 5


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