Questions tagged [routing]

For questions about routing, the process of selecting to which network path traffic is sent. Consider using a more specific tag if your question is about a routing protocol like BGP or OSPF.

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how can we route two routers on one switch in a different network ip

I am trying to connect two routers in one switch to ping each other using IP route . router 0 has 192.168.10.1/24 gi0/0 router 1 has 192.168.20.1/24 gi0/0 I tried putting switch-port trunks on both ...
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CISCO Packet Tracer

Does Cisco Packet Tracer support config memory and config network command? If no, then do enterprise routers still support it?
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How BGP guarantees same route for a forwarded packet?

In BGP all routers choose the best route to a single destination. So for Router A and destination D, A will forward the packet to the next-hop router (let us say router R) after knowing the best route ...
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Lan Routing / Ping From Router to Subnet [on hold]

i would like to setup a cascading Router setup as Follow : Router "A" with Internet on Wan , and Devices "A" on Lan . Another Router "B" which is a Device "A" on Router "A" Lan port . Router "B" wan ...
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25 views

What can be used to automatically draw the topology diagram of any network if CDP is running? [closed]

I have recently learnt how to use CDP to know the remote interfaces and the ip addresses of the neighbours. But I need to manually create the diagram of the topology. I want to know how to create the ...
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1answer
39 views

How to create a routing loop? [closed]

Let's say I have two or three routers and I want the packets sent between them NOT to reach their destination but to "loop" between the routers until TTL runs out." I need to do this in a network ...
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1answer
93 views

How to Run Static IP Through Comcast Business Class Modem to Router?

I apologize in advance for this kind of nebulous question, but I'm very stuck after many hours of trying and I need help. Here's what I have: Newest model of the Comcast Business Class Modem/Router ...
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1answer
19 views

Question On Route Aggregation [duplicate]

Suppose I have these 3 IP Prefixes : 190.154.27.0/26 190.154.27.64/26 190.154.27.192/26 and I want find the aggregate prefix. I convert each address to its' binary equivalent: 10111110....
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2answers
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problems routing WAN with private IPs and LAN with public IPs

I have just installed pfsense 2.4 for a SOHO I work and I'm getting problems with the routing. I have asked my ISP for a /29 network with public ips for the DMZ, but instead of giving my directly what ...
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8 views

RTO timer in EIGRP

Does EIGRP function like this - A packet is sent and the sender waits for acknowledgement. If it gets an acknowledgment, then it updates SRTT timer along with Sequence Number. If it doesn’t get any ...
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1answer
62 views

Subnetting WAN backbone

I am currently redisgning a multi hop wan backbone that links a number of offices and i thought i had the design but after a previous question it has opened the question of if im doing it right. ...
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2answers
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How to advertise a classless network in RIPv2?

In OSPF and EIGRP we can advertise specific networks only using wildcard masks. For example, if a router has networks 10.0.10.0/24 and 10.0.20.0/24, we can choose to advertise only 10.0.10.0/24 by ...
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1answer
88 views

Cisco numeric EIGRP routing IP summarizing and routing

I have 2 routers connected via Serial 0/0/0 both running EIGRP with an ASN of 65000, and i want to advertise and summarize the interfaces, being just my loopbacks, and set the loopbacks as passive. ...
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1answer
20 views

Strict source routing using my own scattered PCs/ routers

I would like to completely control my network transportation by defining the packages path. According to this I can't do it unless I have control over all the PCs/ routers in its way. Suppose, I can ...
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1answer
18 views

Connect 2 VLANs on Cisco SG300 with cable

I have a Cisco SG300 with 2 VLANs enabled, half the switch ports are on one VLAN, half is on the other. Both VLANs use the same subnet. I want traffic to travel between the 2 VLANs. I thought the 2 ...
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0answers
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Why can I ping 10.10.10.140 from 192.168.1.15? [closed]

I'm on a 192.168.1.0/24 subnet, and when I ping 192.168.1.137 I get a response saying the host is unavailable (as expected because I don't have any machines using that address) However, when I ping ...
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1answer
33 views

Both static and dynamic routing in a router?

I've been reading about static and dynamic routing and can't help but wondering if it's possible to have both static and dynamic routing in a router? Would it cause a conflict if we have both types ...
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1answer
30 views

Why doesn't traffic go through router on LAN? [duplicate]

So I thought that when two devices are connected to a router, and if they wanted to communicate with each other, then all the traffic will go through the router(AP). I tried running a traceroute and ...
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1answer
23 views

Ho to implement RPKI for our Network

I would want to implement RPKI in my network. I have gone through some documents by which i cant understand the implementation process. What are the steps i should follow to implement RPKI in my ...
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2answers
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Accessing internal website from subnet

I have the following network: - Edge Lite 3 router with public IP on WAN (eth0) and 2 LANs: 1) eth1 192.168.1.11/24 2) eth2 192.168.2.11/24 eth1 is DHCP, I have several work laptops inside. eth2 ...
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1answer
39 views

Is there a way to determine my network transportation to specific path?

How can I determine my network transportation to specific path. I would like to determine that my data packages will go through specific routers.
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0answers
14 views

ISP Disconnect - Force to online billpay? [closed]

I'm looking to setup a separate VLAN to punt people that would force customers to a notice of disconnection/non-payment/etc and only allow traffic to and from our online bill pay. I believe I can ...
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42 views

Is next-hop-unchanged viable for iBGP connections?

Lets look at following drawing: F6, S1 and R1 are in the same network. F6 and R1 are physically connected to switch S1. There is a eBGP neighborship between F6 and R1, and a iBGP neigborship between ...
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1answer
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Sonicwall TZ105 Site to Site VPN Created can ping gateways but can't ping network from other site

Need help here Site B TZ105 x0 Lan 192.168.162.1 X1 WAN 64.x.x.x X2 LAN 10.0.3.1 Site A TZ300 X0 LAN 10.0.1.1 X1 WAN 69.x.x.x VPN tunnel set up as VPN SITE TO SITE and is Green From Site A I ...
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3answers
2k views

Juniper EX how to clear route forwarding table?

After layer 3 routing a large IPv6 assignment on an EX Juniper switch, the route forwarding table filled up and some entries corrupted or became otherwise invalid. We want to clear the whole table. ...
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1answer
5k views

How do I delete all OSFP settings on a router?

I'm using packet tracer. I want to delete all OSPF setting on a router. I used clear ip osfp process but after that when I do show ip ospf I can still see the process, its area and all interfaces of ...
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1answer
36 views

Default route with interface vs default route with ip [duplicate]

I created 4 routers basically 2 router for default route with interface (g0/0) and the other 2 is defaulted by the ip interface and they did the same purpose. Im wondering what is the different ...
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1answer
37 views

VLAN routing over multiple routers(RIPv2)

I am currently working on a scenario to get a better understanding of the RIPv2 routing protocol but am currently stuck. Please see my picture below to get a better understanding of what I am trying ...
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3answers
84 views

What's the advantage of having VLANs if you enable inter-vlan routing?

If you configure VLANs with each having their own subnets, is there a point to have them if inter-vlan routing is enabled? Since VLANs will have access to other VLANs, the security argument is not ...
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2answers
37 views

Is datagram switching only possible with routers?

So datagram switching is when packets from same original message travel different paths from source to destination. This cannot happen with switches because switches would just run STP thus ...
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1answer
22 views

Router Extended Access Control List

Why can't we place the Extended ACL close to the destination not the source ? What will happen if we do so ?
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3answers
91 views

Do routers understand transport protocol?

We are taught about the difference between hubs, switches, and routers. A hub is a layer 1 device, it only knows layer 1 and doesn't care about layer 2 and above. Similarly, a switch is a layer 2 ...
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1answer
32 views

Is it possible to propagate MAC address back to sender?

Let me first to tell me what I know, please correct me if I am wrong. I know when Ethernet frame travels across the internet then Layer 3 data (Source and Destination IP) remains same and Layer 2 ...
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1answer
22 views

Router Standard ACL

I was configuring Standard ACL on router 1841 on Cisco Packet Tracer with the help of command access-list 1 permit 172.16.40.3 0.0.0.0 and access-list 1 deny 172.16.40.4 0.0.0.0 and then I applied ...
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2answers
36 views

Forcing UDP traffic from specific ports [closed]

Is it possible that all traffic from computer 1 towards computer 2 go thru udp port D of computer 1 and received at udp port B of computer 2. Similarly all traffic from computer 2 towards computer 1 ...
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0answers
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PING being sent to different IP address [closed]

I'm attempting to communicate a device on my LAN, which (should be) IP address is 192.168.250.40 When I PING 192.168.250.40 I get: Pinging 192.168.250.32 with 32 bytes of data: Reply from 192.168....
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2answers
2k views

How can multiple devices share an IP across the internet?

I do realize that most LANs sit behind a device running NAT, which translates the users private IP address to a public IP address. My question is still if you are trying to connect to a private device,...
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2answers
677 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
28 views

Different sized subnets [duplicate]

I am not sure the wording to search for and therefore this question has probably been answered before and i just cant find it. I am puttiing together a small WAN and im using /29 addresses for the ...
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3answers
66 views

Regarding Cisco's hierarchical network design

why routed ports usually implemented between the distribution layer and the core layer ? why not just extend the layer 2 domain to the core layer ? is the other design model more practical than this ...
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27 views

Is it possible to change the Local Preference of a route based on the BGP Community of another route?

Lets assume a topology like the following: |-- R2 -> prefix_1 R1 ---| |-- R3 -> prefix_2 If R2 sets a BGP community for prefix_1, is it possible to trigger a Local Preference ...
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2answers
39 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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0answers
49 views

Famous reverse path check fail, drop on Fortigate, unable to fix

I installed this FortiGate VM for evaluation and seems like stuck with simple basic routing and reverse patch check aka anti-spoofing. So the system just have 2 VLANs on the same interface, VLAN_101 ...
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1answer
53 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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3answers
224 views

What are the minimum requirements to be on the internet?

People often define the internet as a network of networks but this is wrong. If I connected two LANs together that wouldn't nesecarilly be on or part of the internet. In class we learned about ATM, ...
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Is it true that the fd00::/8 address range (ULA) in ipv6 is for machines that you NEVER want to speak with anything on the Internet?

Is it true that the fd00::/8 address space (User Local Addresses) in ipv6 is for machines that you NEVER want to speak with anything on the Internet? I was just reading that here and rather surprised ...
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1answer
61 views

Two switches, one uplink - best way to link them?

Overview I have two Arista 7050SX switches. They don't support stacking. But I essentially will be using them as a stacked pair none the less (just means managing two individual switches). They're ...
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1answer
46 views

Routing and switching [closed]

Can L2 ping L4? From cisco routing and switching Which of the following statements are correct about the network? There are 3 networks in the topology The routers cannot send packets between each ...
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2answers
193 views

Global BGP Routing only by only importing supernet prefixes

I was wondering if global IPv4 Routing can be technically achieved only by importing from the ISP Provider (providing us with a IPv4 BGP full table) a subset from the BGPv4 routes (i.e. all prefixes ...
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3answers
7k views

What is the difference between broadcasting and flooding?

In Open shortest path first routing algorithm, the information about connected links is "flooded" throughout the network. How is flooding different from broadcasting?