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Questions tagged [router]

For questions about network routers, devices that forward data packets between computer networks, commonly at the network layer (layer 3) of the OSI model.

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1answer
311 views

Private IP vs MAC

What I know is that when we connect to another IP, our Public IP gets shared to the outside world, and when they address us they use our Public IP (gateway), and then the gateway directs the ...
3
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1answer
86 views

Cisco Router IOS update

I am facing problem in update the IOS of Cisco 7304 router. I am upgrading from 12.4(24)T2, to 15.2(4)S7 this. but I was boot from this version 15.2(4)S7 it booted proper from flash. But when I put ...
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1answer
164 views

How can I configure link aggregation/bonded LAN for my simple Ubuntu router build? [closed]

I'm spinning out on this one...! Someone please help! I followed this fab tutorial below to make my own Ubuntu based router: How to build a simple router Ubuntu Server 18.04 Which works great using ...
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0answers
121 views

Cisco IP SLA HTTP request with frontdoor VRF

I am trying to use a IP SLA for HTTP on my Cisco ISR 4321 router to check if a website is reachable. The challenge is that I need to do that in a frontdoor VRF. I have configured ip name-server vrf ...
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1answer
150 views

How to see full description, When issuing “display ip interface description” ?? on huawei router

I have a router with many interfaces when I issue the command display ip interface description I get something similar to this Eth-Trunk1.444 10.2.2.2/28 U U <= Gige E To ...
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1answer
56 views

How to understand the juniper's chassis concept?

I searched a chassis article which is introducing the Chassis. MX960 Chassis It's a physical concept there, but I think the chassis is far more than this. because if we in the commands: there shows ...
0
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1answer
737 views

missing Packet tracer physical Tab

hello I am using packet tracer for a while.I use in my college computer. but recently I installed in my pc. when ever I try to add extra ports in my rouer or switch the physical tab is missing
22
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6answers
6k views

What stops someone from configuring their network with IP addresses they do not own?

Here's the scenario. I was picturing a university that bought a range of IP addresses. I think they'd still be inside a ISP (right?), but they'd have freedom to configure stuff the way they wanted. ...
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1answer
233 views

will wireless devices' MAC address be saved on layer 2 switch?

So I know that basically switches work like this (assuming 2 PCs are connected via Ethernet port) - the switch will store the mapping of the 2 PCs' MAC address and the switch ports in which they ...
0
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1answer
47 views

Routing a packet for directly connected network

We have a 3rd party Router code for our networking product. I am a novice networking developer and do not have much idea on routing. However we are facing a scenario for which we seek solution. The ...
0
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1answer
39 views

Connectivity from DHCP-based machines to servers with static IP addresses on the same gateway

I have Comcast service with 5 static IP addresses, using a Cisco DPC3939B as the cable modem. In addition to the 5 machines with static IP addresses, there are additional devices that get their IP ...
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1answer
72 views

Finding the network address for given host IP?

Answer provides the procedure to find the network address when a packet with destination IP(198.51.100.223/21) is reached at a router. But a network packet has the destination IP 198.51.100.223 in ...
3
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2answers
400 views

can we use Cisco 4900M switch for converting single mode (1G) to multi mode (10G) interface

can we use Cisco 4900M switch for converting single mode (1G) to multi mode (10G) interface. Please let me know other possible solutions.
2
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1answer
77 views

Switch 2960, Router 2901, Layer 3 switch 3560 manual reboot query

I'm learning networking. I had however a doubt is there a way to manually reboot the above switches and routers besides the command line? By maybe unplugging and plugging the equipment quickly or a ...
4
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2answers
418 views

With respect to Juniper Networks , what is the difference between 'Fabric Plane and 'Switch Fabric'?

I am struggling with the concept of 'Fabric Plane' and 'Switch Fabric'? I haven't found any clear cut difference between them? Why fabric planes are different in MX960 compared with MX240 and MX480. ...
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1answer
310 views

hsrp on both side of router

i tried to create a simple network topology to test the Hot standby router protocol gateway for "server2" and "server3", and the architecture is shown in the figure below. i would like to clarify ...
6
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2answers
983 views

How does a router know the MTU of a network?

I've done several exercises where you're given the MTU of a net or subnet, but I wonder how routers know the MTU of the nets they're connected. I've learnt that in OSPF protocol this information is ...
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1answer
52 views

License question on router cisco

Could anyone help me on license question on router cisco. Is ADV IP SERVICES LIC the license on router Cisco that all I need if I want to run these features on my router Cisco : L3VPN, L2VPN, VPLS and ...
4
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2answers
686 views

How many pps (64Byte each) i can receive in 1Gbps throughput modem / firewall

I need help with this: If i have 1Gb/s throughput. I can receive how many pps in 64Byte each packet / s? Let's say I can send (Packet / Second - 64Byte) 450,000, meaning I would not only have 230.4 ...
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1answer
35 views

How cable connects to server if routers and switches are virtualized

Looking here for an example, I see: Spine Device Interface Summary As previously stated, the validated design includes up to 4 spine devices and up to 96 leaf devices that are interconnected by ...
0
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1answer
31 views

If all corporate (large scale) networks require routers

Wondering if all large-scale networks require routers or if there are other devices or things that are used in practice in some corporations instead of routers that solve the same or similar problems ...
0
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1answer
96 views

If physical switches are necessary in a SDN

Exploring how to implement a Software Defined Network and here it explains that an SDN switch is only dealing with the data layer. But then: Do We Need Special SDN Switches for SDN Networking? ...
6
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1answer
429 views

Two boot system images in cisco router

on my router I have two boot lines: boot-start-marker boot system flash c1900-universalk9-mz.SPA.157-3.M3.bin boot system usbflash0:c1900-universalk9-mz.SPA.157-3.M3.bin boot-end-marker I have a ...
2
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1answer
50 views

Need help to replicate the results of a tutorial on Frame Relay Configuration on Router. What do I need to change/add?

I'm having trouble getting the output shown at 03:14 here: Frame Relay configuration by Kevin Wallace My Network is 3 routers, each connected to the frame relay switch via Serial2/0 interface, with ...
2
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2answers
608 views

Is “Host unreachable” the same as “Communication administratively prohibited” in Access List ping response?

Below is a portion of my topology. Faculty of Arts student subnet should not be able to ping Faculty of Arts staff subnet but the staff should be able to ping the student subnet. I know that this ...
2
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1answer
91 views

How to make PCs in the same LAN but on different networks communicate

Is it possible to ping PCs in the same LAN but on different networks? I've done RIP version 2 on all the routers. They all can ping each other. However, the PCs cannot. For example, when I try to ping ...
2
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0answers
54 views

DHCP ivp6 vs DHCP ipv4 router config (cisco)

When setting up a router as dchp server in ipv4, we specify a pool under which we give the network and the default-gateway and that's it: However in ipv6 stateless dhcp , we create the pool then ...
0
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1answer
66 views

How does a router forward datagrams from the internet to an interface of a private network?

As I have seen in How does a router know to which PC in a network to send a response from a server? if I haven't misunderstood it, if an interface in a private network sends a Datagram to the outside ...
2
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1answer
382 views

QOS police vs bandwidth - is this configuration wrong?

I understand bandwidth in QOS is use to guarantee a minimum bandwidth I understand police in QOS is to set a limit to the maximum bandwidth. class test_out police **1608000** 50000 100000 conform-...
6
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2answers
409 views

How to connect a special device in a network

I have a question which is puzzling me. I have a couple of custom electronic devices (are identical, one is a master and the other is a slave) which implement only up to level 2 of the ISO/OSI layer, ...
2
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1answer
81 views

Securing J-Web interface with user lockouts after multiple bad login attempts

I have a bit of an odd question that I can't seem to find much success in getting an answer via web searching. I'm wondering if there is a way to secure the J-Web interface with user lockouts after ...
0
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1answer
22 views

i cant configure the ip adress and subnetmask ,i only have one router “1941” and 2 pc's

the command line is this : Router0(config-if)#ip adress 192.168.1.1 255.255.255.0 the error message is : % Invalid input detected at '^' marker.
3
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1answer
805 views

I can't set a gateway of last resort

I can't seem to get to set a gateway of last resort on a router. I want it to forward anything whom's ip address is not in the routing table to router HQ through interface s0/0/0 by doing the ...
2
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1answer
120 views

Cisco Embedded Packet Capture with NAT

I love the ability Cisco's Embedded Packet Capture (EPC) provides to remotely troubleshoot dataflows on IOS routers. monitor capture buffer CAP_BUF monitor capture point ip cef CAP_PT gig 0/0.1 both ...
2
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1answer
41 views

JunOS iBGP and return paths odd behaviour

I've got a somewhat basic iBGP configuration with a routing instance "global" between two Juniper vSRX's - each Juniper vSRX has an uplink of its own from a different transit provider with a default ...
4
votes
3answers
112 views

Native IPv6 load balancing

We have two software gateways (on Linux) for IPv6 that take fullviews from ISPs and announce our AS. And several nodes connected to Internet via the gateways. Something like at picture: And we ...
1
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1answer
46 views

Etherchannel configuration on two differents routers and 1 L3 switch

Is it possible to configure an aggregation etherchannel between two routers and one L3 switch, means that : the one link in : R1 <-> L3 Switch1 , and the second aggregation link in : R2 <-> L3 ...
3
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1answer
230 views

Can't ping the management IP of Switch

My topology is: I am logged in to R1. I can ping 10.0.0.2 on R2 and 198.51.100.1 on R2, but can't ping the management IP of sw3 (198.51.100.2). What am I doing wrong? R1#sh ip arp Protocol Address ...
1
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1answer
279 views

Why command “ipv6 dhcp relay” doesn't work at packet tracer?

I'm trying to enable dhcp for ipv6 with the "ipv6 dhcp relay dest" command but, I'm receiving an error and I'm trying both of these commands but none work. Router model: 2811 (config)# interface [...
3
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1answer
74 views

Quagga router advertisement messages are wrong after an address change

I have a problem with Quagga OSPFv3 implementation. I have a Mininet topology with a host connected to a router. I assigned an IPv6 address to the router interface. And I enabled IPv6 ...
1
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2answers
96 views

Gather the BGP data by using TCP connection on port 179

In order to gather the information shared between BGP peers, what port number should be used to connect using TCP (I am using 179, and don't see the connection being established)? Will I be able to ...
2
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2answers
474 views

How can two interface communicate between them with different subnet

R1 and R2 are connected with serial cable interface but both of them having different subnet and i know they will not communicate so what are other options two communicate between them without the ...
1
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1answer
159 views

Inter Vlan on L3 switch

I do an inter-vlan L3 switch lab on Eve-ng emulator. The topology like below And this is output from some show command at the L3 switch: Building configuration... Current configuration : 1422 ...
1
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1answer
286 views

How does a packet travel across multiple routers/subnets?

After reading various resources and examining the example below, the step-by-step process for a packet to travel the route below is still not 100% clear to me. I'm hoping to get clarification. Image ...
2
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1answer
30 views

All routes about a IP in my Router AS-PATH last AS number is Idle

I can not ping the IP 202.137.151.185 from my router. and in my router I show a IP's route, there gets the following information: admin@EE-MX-RE1# run show route 202.137.151.185 ...
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2answers
382 views

Can I scp a file to Juniper router's Console port?

When I try to scp a file to a router on its console port, it says: "lost connection" Is it not possible to share a file with the router on console port? If not, why?
1
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1answer
94 views

OSPF inter-area traffic - not so direct after all

a) Can I confirm inter-area traffic will be routed towards Area 0 / Area 0 will be the transit network for all inter-area traffic? b) Consider the diagram below q1) Does R1 receive Type 3 LSA for ...
3
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2answers
894 views

What's the difference between Ethernet link and Serial link?

Sometimes we see router connected use Ethernet link, sometimes use Serial link, what's the difference between them? and in what scenario we use them?
2
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2answers
72 views

If the Router's Gig0/0/0 to its Gig0/0/1, whether only cost one TTL value?

I have questions about the TTL value. whether the Router3 Gig0/0/0 to Gig0/0/1, there will cost one TTL? if the Router2 Gig0/0/0 to Router3's Gig0/0/0, will there cost one TTL? or do not cost? if ...
6
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3answers
1k views

Why is the BGP base on TCP 1027 rather than 179?

Why is the BGP foreign address port 1027? I use BGP to connect Router1 and Router2, but when I show the TCP progress: Router1>show tcp brief TCB Local Address Foreign Address ...