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Cisco is a major provider of networking equipment. This is a generic tag to be used when no more specific tags are available. See the list of tags in help center Tag page.

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Is an SBC sufficient and can it NAT

We have a gateway which faces out to our VoIP SP. As we get more users we need some security in front of it. Currently our gateway terminates directly to the SP. We would like to put a SBC in front ...
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1answer
36 views

Layer 3 switch model 3950 encapsulation

How to ensure trunk link in the switch are using dot1q encapsulation, when dtp (dynamic trunking protocol) is enable along with vtp. I know when manually setting trunk links, you can force the trunk ...
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MultiLayer Switch to Ping different Switches and routers under different VLANs

Hey Guys, So this is basically a small design of a made up university which has 3 campuses( the 3 routers).Each connected to 1 College(Switch) and each college connected to 3 other Schools(switches) ...
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Are there any network devices that can be configured to add information from one layer to another?

If I have a corporate network, no WWW Internet outside of it, only different subnets. Can a Cisco router or switch be configured to take information from one layer and embed it in another layer? For ...
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2answers
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+50

Anycast Gateways

Can anyone shed light of anycast gateways. Typically Ive seen each pair of leafs within a fabric configured with MCLAG and a different IP used for the gw address across each pair of leafs. However, ...
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55 views

Cisco 2960 not receiving dhcp from the router

I have a problem with Dhcp of some the Vlans. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. each switch has a subinterface of the router ...
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1answer
28 views

Cisco nexus 3048 SFP validation failed

I have cisco Nexus 3048TP switch (48x1G + 4x10G) Hardware cisco Nexus 3048 Chassis ("48x1GE + 4x10G Supervisor") Intel(R) Celeron(R) CPU P4505 @ 1.87GHz with 3665240 kB of memory. ...
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3answers
1k views

How not to route on a Cisco router

So we have a router, with a switch card interface, 8 ports Say I have 4 VLANs (A,B,C,D) on it, with 2 switch ports in each. Each VLAN (i.e. all ports) can communicate with each other, because ...
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Can't save configration in router(gns3 )

I have installed gns3 v2.1.9 with gns3 vm(oracle v5.2.18) in my Ubuntu 64bit v18.04. I have installed 2 routers 3725 and 3745 in gns3 vm. But if i try to save my config with copy running-...
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1answer
49 views

How to solve a BKN* Port Issue on a cisco catalyst

There is a Cisco ISR 4451 connected with Portchannel to a Catalyst 3850 Stack and there are some VLANs enabled, but only one does not come up for a Portinconsistence. I figure out an Issue on the ...
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1answer
31 views

Connecting Layer 2 switchport to layer 3 port

I have a config that I am trying to bring up, and in my mind it should work, but perhaps I am missing something. The idea is that one end of the link is a layer 3 interface on a router. The other end ...
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2answers
32 views

Cisco router with switch interfaces help

I was wondering if a connection comes in on a Cisco router interface. Can that connection be pointed towards a switch interface if said router has a switching module? I haven't tried it, but I'm ...
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1answer
48 views

ASA5516 9.8(2) IKEv2 (no BGP) site to site connection with Azure fails

I have a Azure subscription, with a virtual network where the gateway subnet is 172.26.0.0/27, and then I have a number of subnets, e.g. 172.26.1.0/24, 172.26.2.0/24, 172.26.3.0/24, .... On the ...
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1answer
32 views

Pass traffic from remote access to site to site tunnel

I have situation where remote access ipsec client have to connect to ASA firewall to send and receive traffic using site to site tunnel on the same ASA, in the logs I am seeing packets dropped as it ...
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1answer
253 views

Is there a way to “Pass through” a MAC address on a Cisco Switch?

We have two systems connected together, and the end system (system 2) relies on differentiating packets via MAC address from system 1 (it has two routes). For testing purposes, we want to put a ...
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2answers
42 views

Possibility of using Cisco “port security” in sensor networks?

Is it possible to use Cisco port security (to prevent a host changing its Mac address) in sensor networks? In a more general question, is Cisco port security platform independent? Meaning that it is ...
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2answers
36 views

Access port keeps changing to trunk port

I have a cisco Sf250 Switch, all are working fine except one port. I have made it to work as a access port but it keeps changing to Trunk port over time. I have switched ports but to no avail. Any ...
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Cisco ASA 5512 one download blocks all others until download finishes

My company has a 50 Mbps Down/Up connection. I just migrated from a PIX 515E to an ASA 5512. Previously, one user could download a large file from the internet and block all other users from accessing ...
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1answer
26 views

Cisco RV325 VPN to Remote Site with Multiple VLANs

We've been running a VPN over two Cisco RV325's successfully using the following mapping: Site1: IPS="NAME=g2gips0&WEBNAME=Site2&LSUBNET=10.10.0.0&LMASK=255.255.255.0&RG_IP=71.XXX.XXX....
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1answer
25 views

Can i implement BGP flowspec

This question is for general information about BGP flowspec, Can i implement BGP flowspec to stop DDoS? RTBH isn't what we want because it blackholing all traffic, we want RTBH at Layer 4 level where ...
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1answer
48 views

R2 and R3 cannot ping each other

below is a capture of the configuration. R1 can ping the other two routers but R2 and R3 can't ping each other. Any idea what my issue could be? Screen Shot 2018-09-03 at 2.57.00 PM.png Router2#sh ...
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1answer
33 views

How to install firewall under a router [closed]

Recently purchased Sophos Xg 125 firewall, previously am using Cisco Rv325 router with 4 Vlan, My question about for configuration is that 1.how to configure my firewall under this router because ...
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1answer
24 views

How to compute the round trip delay

I have a query on how to compute round trip delay. I know it is 2 times the propagation time, but let's say I have a packet of 100 bits and a transmission speed of 2 Gbit/sec, how do I compute the ...
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1answer
39 views

Cisco ios - loading 15.2 into Catalyst 2960

Is it possible to load cisco ios 15.x into an old 2960 or 3560? I tried to do that (study purpose) and it's throwing an error. The error I see apparently has to do while decompressing the image or at ...
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77 views

How to connect to a non VLAN Router device from a Trunk VLAN on a catalyst Switch

On a Cisco Catalyst 3850 Stack there is attached a Link to a Carrier who provide a few connections seperated with vlans (100,101,...) so I create a VLAN 100 on my cisco switch and setup a IP Address ...
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1answer
43 views

Show interfaces brief information

In packet tracer if you hover over a router you will see its interfaces with IP addresses, vlans, etc. However during my CCNA exams (during the troubleshooting) this feature is disabled. Is there a ...
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1answer
37 views

No access to internet from DMZ Cisco ASA 5512

Glad to join the forum. I hope to get help too and help as much as I can. Currently I have a big problem. I am using Cisco ASA 5512. I defined 3 interfaces on the firewall: inside (192.168.0.0), ...
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25 views

Guidance on AdTran vs Cisco Configuration

I have just turned up two t1 lines hooked into two AdTran NetVanta 3430 routers. While the NetVanta boxes seem fine, what I really want to do is to configure some of my old Cisco boxes to handle the ...
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1answer
33 views

Help this problem with Dhcp Server with two switches

I will try to explain my problem. I am trying that Switch 1 can give dhcp for pcs but i cannot, in Switch 0 I can give dhcp server in the pcs. sorry for my bad english ROUTER ! version 15.1 no ...
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1answer
47 views

PoE Problem - Off / On / Off Cisco 2960

Running 2 new switches Cisco 3850 - stackwise 480. When I plug a PoE splitter into the switches it works fine. Cisco IOS Software [Everest], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), ...
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1answer
24 views

Cisco ASA access list on interface on which cryptomap is applied

I am a newbie with Cisco ASA and I have a question. Thank you in advance for answering. Take a Cisco ASA that has an internet facing interface. On this interface a cryptomap is configured with some ...
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78 views

Prevent OSPF routes advertised by other routers from entering the routing table?

I have a fairly complicated scenario that I've managed to duplicate with GNS3. Please see the attached image. In this scenario I have four "Branch Offices" each with their own router connected to ...
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1answer
55 views

cisco 3750x switch boot loop after failed IOS software upgrade

I was trying to upgrade WS-C3750X-48T-S IOS software from universalk9-mz.122-53.SE2.bin to c3750e-universalk9-mz.152-4.E6.bin First I deleted all files under flash: folder, then downloaded new one ...
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33 views

Cisco ASA 5506-X create a NAT rule via GUI/cmdline

Hi the Stack Community ! I have some problems with creating a NAT rule with that Cisco device, (of course you already undestand that I m a beginner with Cisco devices ^^) The configuration schema ...
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3answers
75 views

Will this SFP Transceiver run over OM1?

I'm fairly new to fiber cabling. I have an OM1 cable (running 750 metres) already installed on a site that currently works fine on an old system that is being upgraded. I'm trying to find out if these ...
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1answer
30 views

Create Accounting for Internet and merge ADSL, is there any way? [closed]

I have 4 Simple Wireless ADSL Modem that 4MB, 8MB, 16MB, 40MB Internet BW. I have one HP Server with 4 Network Ethernet Ports. I have 7 LAN based PC's, 2 Network Printer and some wireless station ...
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1answer
73 views

Cisco ASA context OSPF configuration issue

I've two cisco ASA configured in active/active HA. ASA is connected to switch with port-channel. Switch configuration: interface Port-channel47 description ASA2 switchport mode trunk switchport ...
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1answer
29 views

Simple NTP question

Setting up NTP on a cisco 3560 so clients can be all on the same time. The switch it only used at layer 2. Outside of having a management VLAN for SSH, there isn't currently any config for anything ...
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1answer
27 views

Change firewall rules of a Cisco Router from network

I'm looking for ways, methods or workarounds to: Change firewall rules (WAN/LAN accept-deny) of a Router from networking, through Linux command or PHP script, can be a socket, or rest service, soap ...
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2answers
65 views

EIGRP Routing Issues

I had an issues about EIGRP. But first, here's the topology : I've done EIGRP Routing, but it's kinda strange. PC0 -> PC1 is able to ping, PC3 -> PC2 is able to ping. But, I can't ping PC0 -> PC2, ...
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1answer
41 views

Latency in Network [closed]

My company uses trading application where latency is utmost important. I have few ideas but really dont know how to implement. Like I want to know 1) How can I Prioritize applications by 802.1q tag. ...
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2answers
37 views

How to connect Cisco Catalyst 2960G using a RJ45 Console Port

Got a used Cisco Catalyst 2960G-24TC-L switch for studying networking and having a fundamental issue. As I new to networking, I'm trying to figure out what type of cable I need to use for connecting ...
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0answers
33 views

Configuring Cisco IR809-G LTE router config help

sorry in advanced for the long post this has been racking my brain for 4 days I am extremely new to cisco and need to configure an IR809-G router with a failover script to that if one sim fails it ...
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1answer
22 views

Cannot open HTTP web page for Cisco Aironet 1815i Autonomous Access Point

I have two Cisco Aironet 1815i Autonomous Access Point connected to the network already and getting IP addresses from the DHCP server. But I am not able to open the web page for the configuration. ...
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1answer
44 views

Cisco 2960X - Add Stack Member

I need to add another Cisco 2960x stack member to our existing stack and I just want to check that the steps I have in mind are correct: Power up the new switch and check that IOS matches that of the ...
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1answer
32 views

Cisco 892 Low WAN Speeds [closed]

I'm getting really not-gigabit-close speeds on my Cisco 892 Router. LAN speeds are fine (750-800Mbps) but WAN speeds are awful. I have a PPPoE connection, and when doing a speedtest I get an average-...
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1answer
37 views

Cisco 3560 Jumbo Frame

looking for some clarification on the jumbo frame config for a cisco 3560 switch. I understand that by enabling jumbo frames, it enables it on all ports for entire switch, what happens to devices ...
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0answers
27 views

Port 50000 UDP not passing traffic in cisco 1921/K9

I have two devices that use UDP on Port 50000 these are on vlan 103 they are IP's .222 and .223 trunked to an HP switch I have tried several ACL's but no luck, router config is as follows, Building ...
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2answers
51 views

Configuring VDSL on Cisco 897? It Won't Dial!

I am new to Cisco products and have been following some online guides detailing the steps requested to set up but am stuck in a bit of a rut. I believe all correct interfaces are configured and have ...
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2answers
41 views

Cisco Router 1800 series doesn't route internet

Working on an issue with a 1800 series Cisco Router. Router get's Internet just fine, can ping Google, Microsoft, etc.. Router is connected to a switch, switch connects 2 workstations running Windows ...