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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63 views

How do VLANs Work? Some Basic Questions: [closed]

I've recently started looking into VLANs. I am a network novice so bear with me please:). I have a few questions regarding VLANs. I understand that certain managed switches allow you to create VLANs. ...
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99 views

Why are there so many more dual-band (2.4 & 5 GHz) Wi-Fi APs than single-band, 5GHz-only ones?

Why are so many more dual band (802.11n 2.4GHz & 802.11ac 5 GHz) APs than single-band, 5GHz-only ones? Is this for backwards compatibility?
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Does every router in public network knows all the other public interconnected networks in the world?

I am reading this article https://www.practicalnetworking.net/series/packet-traveling/host-to-host-through-a-router/ , trying to learn how a packet is delivered between different networks. It says: ...
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Hide SSID to block probe requests from clients

According to this Answer clients are sending probe requests to discover wifi networks. If I hide the SSID the AP wouldn't need to handle these probe requests and therefore the workload would be lower....
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3answers
118 views

Does a router send its own mac address or the mac address of the user?

When a request is made, does the router send its own mac address or the mac address of its user? Does it send the mac address at all? My specific case is the following: I am getting a 4g sim card to ...
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2answers
188 views

Can a router route 2 switches with multiple vlans and subnets

Good afternoon/evening, Today on my Cisco Packet Tracer, I made two layer 2 switches and 2 PCs on each switch. I created a vlan 10 on the switches. I trunked the switches together so they can see ...
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2answers
2k views

What's the DF flag mean in IP packet header?

In the IP package, there is DF flag: Don't Fragment. I have doubt about it, is it mean let all the L3 device do not to fragment the IP packet (if the L3 device found it is bigger than MTU, device ...
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1answer
35 views

Modern routers: number of NICs, ports and mac addresses

I read that NICs in modern routers are responsible handling of multiple ports. Is it true to say that every port has a different MAC and IP address, and thus a NIC might have multiple different MAC ...
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120 views

Using 2 different ISP In case one dies

It's my first ever post in here and I hope not the last. I'm looking for some advice. I'm trying to reduce my internet downtime for a local network. My setup. Mix and match computer environment (...
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1answer
62 views

Router RIPv2 displaying subnets not directly connected

Is there a way to show subnets on "Show IP route" that aren't directly connected, but are a hop or 2 away? Is this with Router RIPv2 "redistribute" or is there another way? Thanks
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1answer
138 views

Upgrading Cisco 819 to 809, can I connect devices to 2 routed ports and be on same subnet?

The company I work for has multiple remote "IoT" style sites connected back to the datacenter via a Cisco 819 cellular router. We are in the process of upgrading these to the newer Cisco IR809 routers ...
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2answers
610 views

Router on a stick not connecting 2 different VLANs

I have a setup which requires two different VLANs to be able to ping one another. I have a setup with 2 - layer 2 switches and a router that has defined sub-interfaces, and for the life of me, I ...
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108 views

If you're behind a firewall and all the ports are blocked, how is your browser able to access the internet? [closed]

I'm behind a router and I'm able to run game servers on my home computer after forwarding ports or using the DMZ feature on the router. However, I still don't understand the underlying technology as ...
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370 views

Reasons for buying ASN for organisation that are located at single place

I see here that even some organisation/universities have bought ASN which are located at single location. What benefit they will get by buying ASN ? Is it compulsory to buy ASN if I have to buy some ...
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90 views

802.1ad (QinQ) and router

I am a little bit confused. Is router aware of VLAN tag? What happen when tagged frame comes to router? (without any extra setting like encapsulation) Or what happen when QinQ frame comes to router? ...
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46 views

What is benefit of allocating ASN to edge routers and not Ip addresses

What is benefit of allocating ASN to edge routers and not Ip addresses ? I mean we could have given these edge routers unique public ip addresses too ?
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107 views

I need help in creating OSPF between MultiLayerSwitch and Routers in packet tracer

I know we cannot create OSPF with different subnets. What network addresses should I put in the MLS and R1 to make it adjacent? Here's the configuration for MLS: interface FastEthernet0/15 no ...
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3answers
394 views

Why ip nat {in,out}side?

Although I understand how NAT is configured on Cisco, a broader question came up about the why behind it. When configuring e.g. NAT overload, you specify a few items: An access list ... ip access-...
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234 views

Cisco SMB Switch Configuration for VOICE VLAN and DATA

I am hoping to get some assistance with a current issue I am facing at the moment... I have 3 Cisco SMB Switches, (2) SG300 Managed Switches and (1) Unmanaged Switch. SWSG1 | 172.16.1.100 | Port 24 ...
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144 views

Cisco 1841 stuck on boot?

I found an old Cisco 1841 router and decided to boot it up to play with it a little. Everything seemed to be going ok but I guess something interrupted the boot. Last line is %SYS-6-...
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1answer
84 views

What is a meaning of Load balancing Hash

What does Load balancing Hash mean in CEF? Which commands are use to configure? Is it support to other vendors except Cisco? If it is not support other vendors? do they have any similar concept? Which ...
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1answer
3k views

What's the difference between DHCP Disabled or Relay on an access point?

I am trying to turn my old router to an access point for the new router, I assigned an IP address in the range of the new one and when I went to disable DHCP there was another option which is Relay ...
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68 views

why doesn't WireShark show any traffic from invalid certificate https site? [closed]

i have tried mobile apps like HttpCanary and pc programs like wireshark still got nothing from the site !!
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1answer
200 views

Is OSPF router ID unique per area?

I found online that the router ID must be unique within the OSPF domain. But what exactly is an OSPF domain (an area?). Let's take the following topology: Can R1 and R5 have the same router ID, as ...
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1answer
3k views

What is the purpose of a switch routed port?

From my Cisco CCNA documentation: Routed ports are used for point-to-point links. Connecting WAN routers and security devices are examples of the use of routed ports. In a switched network, ...
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2answers
153 views

Regarding Administrative Distance

Different vendors use different Administrative distance for the same protocol.For example, in a Cisco router, the eBGP, AD value is 20, whereas in Arista routers, it appears different(i believe, 200). ...
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273 views

How to use IXIA IxNetwork 8.40 to send bi-directional traffic between CPE and router

My setup is: IXIA -- CPE -- router -- IXIA I have one end of the IXIA connected to CPE, and getting private IP (DHCP from CPE). Other end is connected to router side and has public IP. Traffic ...
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3answers
1k views

Does anycast addressing add additional latency in any way?

Does anycast addressing, in itself, add any additional latency to network connections? Specifically, if you had two servers located in the same data center that had extremely similar routes/number of ...
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6answers
576 views

Is a “LAN” a layer 2 or a layer 3 concept, in TCP/IP?

I think my question is purely theoretical and a matter of definitions; it derives from the fact that a L2-switch with VLAN capabilities is able to "create" different virtual LANs, and thus I am led to ...
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1answer
70 views

SNMP object not in the MIB

i'm working on an SNMP app that needs the ptopo MIB object with the object ID of 1.3.6.1.2.1.79 after enabling SNMP v3 on 2 layer 3 switches dell z9100-on brocade slx 9140 and creating a view on ...
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1answer
92 views

BGP | Advertise a summary prefix out to customer location

I don't know what I should be using for this or how I should go about it. In my lab where I am testing out the BGP configs that I've learned I want my ISP topology to have a summary prefix for the ...
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1answer
133 views

Layer 2 and Layer 3 traffic with one cable

Hers the topology. L2 switch L3 switch Router There are 2 VLANs. One VLAN ends on the L3 switch 1 VLAN on the router. Here is the question. Can i connect the L3 switch and the router with just 1 ...
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2answers
95 views

How to configure snat between 2 private networks having different nat pools?

Hi, i'm having some problems with the current configuration i have on this network. I have two nat pools one for the blue square routers, and another for the yellow ones. And i'm using snat to have a ...
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3answers
289 views

How to configure NAT between 2 private network ? CISCO routers

If anyone can help with configurations it will be helpful
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2answers
48 views

How many public static ips do one need if a PC is behind a wireless router?

If a PC is connected to internet through a wireless router. How many public static ips do one got to get from the ISP. Do the router and PC both require one static IP. What if I want to add more PC ...
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1answer
69 views

LAN to LAN Connectivity of Moxa routers

I am with background of DevOps and to optimize stuff in office i am assigned a networking task with not much experience of networking. My scenario is like below I have two moxa (EDR-810) routers ...
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2answers
336 views

How to cascade two routers [closed]

When I connect two (Zyxel) routers in a cascade configuration, I don't know how to set the right address on the Lan Interface between the outer router (the one on the top of the diagram) and the inner....
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1answer
435 views

My Juniper Router arp do not work, after clear MAC then it can work

In my MX Juniper router device, there have the IP 16.213.40.1's address: {master} admin@juniperMX> show arp no-resolve | ...
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2answers
282 views

What are neighboring ports?

I know this is as basic as it gets but I can't find a direct answer to this question. Are they ports on two different switches (or routers) that are connected by a cable? Are they the ports ...
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2answers
65 views

Overload PAT Question

Learning details of NAT PAT. I understand basics wherein the PAT router incorporates a source port to ID the private address computer communicating out on the public address, enabling the public ...
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2answers
98 views

How can a IP under a VLAN communicate other VLAN's IP?

I have a network topology as below: I want to use the Server0 to manage(communicate) to 10.10.10.1-3. you know the 10.10.10.1-3 are vlan100's SVI. there have vlan 100 and vlan 501. IP programme: ...
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1answer
62 views

RIPv2 Routing not pinging between two serially connected routers?

I'm new to networking and am currently 6 months into a course for it so there may be some noob mistakes or really silly answers/questions here but bare with me. I have a task to setup RIPv2 routing. ...
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1answer
30 views

How does a router calculate a MTU [duplicate]

For a given link type, how would a router calculate it's MTU? I initially thought of it taking a brute force approach, using a binary search to figure out the point at which the link fails to support ...
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1answer
133 views

Route between two routers

This is the topology I'm working with. I'm able to ping from VPC_LAN_Ato VPC_LAN_B and trying now to ping from those lans to Router_2_Cisco. Here are the configurations for these 4 devices: ...
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1answer
243 views

Can't ping across router with two interfaces [closed]

This is the topology I'm working with. In the router, e0 is ether1 and e1 is ether2. LAN_A has a maximum of 96 clients. LAN_B has a maximum of 48 clients. VPC_LAN_A: ip 192.168.10.1/25 192.168.10....
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1answer
152 views

Ingress filtering on edge routers and performance concerns

The RFC 4778 cover the Operational Security Practices in ISPs Environments back on 2007. Among the best practices, a common one is Ingress Filtering on edge routers. In the above RFC, the author says ...
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2answers
488 views

What happens if we try to access an IP Address that does no exist

Beginner Question: I just read an article talking about how the internet works and how routers make sure that packets arrive at the destination. However there is one thing that is not explained ...
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1answer
400 views

High CPU utilization on Juniper ACX2100 chassis fpc

What is the cause of high utilization of cpu on fpc.Below is the output of which depicts utilization as 99 but router is running just fine. show chassis fpc Temp CPU ...
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1answer
204 views

High Memory Utilization in Juniper ACX2100

Recently i observed that one of our juniper AC2100 has only free 3% of memory.But i'm unable to understand which thing is causing such high memory usage or what i can do free the memory so it won't ...
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2answers
52 views

Configuring routers on Cisco

If I have three routers R1, R2, and R3 that are interlinked, then when configuring, do I have to give the command: description Link to R2 description Link to R3 when configuring R1?

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