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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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
38 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
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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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40 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
25 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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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
38 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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1answer
64 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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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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0answers
33 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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3answers
68 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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2answers
41 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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130 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
66 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
115 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
69 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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2answers
196 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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1answer
50 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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0answers
16 views

GE Orbit MCR Networking Questions [duplicate]

Some background: I am working with a small network (20 remotes/1 master) of GE Cellular Orbit MCR Radios. Setup: AP: DMVPN GRE Interface IP =192.168.37.1 GRE Interface Prefix = 255.255.255.0 VLAN ...
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0answers
12 views

Zywall USG 100 IPSec Routing

I own a Zywall USG 100, that manages 5 networks (2 WANs, 3 LANs); I built a site-to-site IPSec VPN with our CED, but now I'd like: to deny access to VPN from 2 of 3 above LANs, forcing them to reach ...
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0answers
26 views

HPE 3800 stack routing fails if a certain member is off line

We have a pair of stacked 3800's connected to a pair of stacked 2920's.  We have inter vlan routing enabled with a different subnet on the 2920's.  This has been up an running for about 3 years ...
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1answer
24 views

What are possible causes for high external delay in loading times of web pages?

Here's the scenario: I have a web server that serves static content through nginx. Accessing a page form this web server using the internal IP address gives a loading time of 0.2 seconds. Accessing ...
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0answers
41 views

EIGRP Adjacency Table

From Cisco IP Routing by Alex Zinin According to this figure Adjacency Table gets messages from DUAL module also.As far as I know, Adjacency Table is populated only because of Hello packets exchanged ...
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1answer
42 views

How to make a printer visible to two different subnets?

How are you? I hope well. As you can see by the tittle I'm in the middle of a situation that i have to access a print in another subnet. These subnets are operating in different switches(Switch A and ...
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1answer
18 views

Mask Extension and Logic Minimization

I was reading a paper (Routing Table Compaction in Ternary CAM) which reads as following : "The mask extension technique reduces to a logic minimization problem. In the discussion, I use cube to ...
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3answers
317 views

Leaf-Spine network without routing

If I have a leaf-spine network with all the servers on the same subnet, say 10.10.0.0/16, do I need a router (or l3) since everything is on the same network and the network is flat?
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1answer
37 views

Setup VLAN within fiber SFP switch with a ROUTER

Good day, I am simulating a setup as below: The configurations as below: 3 switches are joined with fibre optics in TRUNK mode. PC0 joined to gigabit port of switch in VLAN 20 (192.168.2.55/24), ...
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0answers
21 views

iptables forwarding to local interfaces [closed]

I have the following setup: MY-PC: eth1: 192.168.1.1 - - - 192.168.1.2 :eth0 :SERVER: eth1: 192.168.2.2 My SERVER can be used as a router and is not restricted by iptables. (No restrictions in the ...
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1answer
88 views

Will this network diagram cause broadcast storms?

I have three VLANs, and I want to communicate between them, but all packets are dropped. I made a trunk to allow all VLANs. Should I use STP to control broadcast storms?
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2answers
39 views

How router ports allocation doesn't drain

Let's take a classic example. My computer sends a GET request to stackexchange.com. Here's how I understand the procedure: For sending this request, my computer allocates a temporary port for this ...
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1answer
41 views

why do I need the network name between two routers for RIP routing?

the network in my exercise I am learning about networks and I just started to learn about dynamic routing(like RIP) but there is something I didn't managed to understand and is why do I need in the "...
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0answers
16 views

WatchGuard interface with secondary router holding WiFi splash page

I have a captive portal splash page I need to be presented to only 1 Open Wireless SSID on a WatchGuard AP controlled via the XTM330. The WatchGuard is not able to present the required splash page ...
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0answers
211 views

pfsense in multi-WAN: OpenVPN route all traffic through VPN, how to set the gateway?

I have an OpenVPN running on pfSense in a CARP with multi-WAN. OpenVPN listens on all incomming (0.0.0.0) so that I can enter throu what ever WAN is active right now should one go down. When I ...
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1answer
55 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
104 views

JUNIPER EX-2200-C Layer 3 Switch Configuration

I am setting up attempting to simulate a small infrastructure of Clients and Servers. Current Setup 1x. Dell Inspiron Tower Running ESXI 6.5 1x. HP Z800 Workstation Running ESXI 6.5 1x. Juniper ...
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2answers
51 views

why does not the Internet require a single routing protocol for all stand-alone systems?

why we are not using one routing protocol like OSPF for example for all autonumus systems.
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1answer
84 views

How to firewall choose routing through ospf?

enter image description here i have this case:on firewall 1 and firewall 2 configure routing ospf and vrrp in the same time traffic go to internet through firewall 1, from firewall 1 routing to ...
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2answers
59 views

Sending an ipv4 packet to the Destination IP without a router?

We are replacing a "RF modem + Router system" with a Software Defined Receiver. After analyzing the receiving and sent signals we found out that an IPv4 UDP packets have been sent and received. The ...
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1answer
37 views

Inter VLAN routing Issue with 4G connection

We have new branch and we will connect it through 4G routers "WAN connection" and L3 switches as below Fig. From 1-Branch Switch i can ping the 2-Branch Switch, but from (PC-1) i cannot ping (2-...
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2answers
955 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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3answers
196 views

How to add multiple ip address in destination ip in acl rule

Iam trying to block a certain host from sending any message to any host in the network is there is a way to do that or i have to deny host by host ?
3
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1answer
69 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
57 views

RDP on IPV6 using DS-Lite-Tunnel [closed]

I am trying to access one of my PCs from and external network using RDP on port 3389. After realizing my ISP uses DS-Lite-Tunnel I gave up ipv4 and focusing on ipv6. So far the only way I managed ...
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0answers
14 views

Connect a Multicast sparse-dense deployment with a sparse deployment

I am working on a task that involves deploying a new network in parallel to the existing network. As a part of this deployment we are going to cross connect the two networks so that it will allow for ...
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1answer
40 views

Static routing using 2 routers and 1 multi-layered switch

I'm trying to configure a static route between two routers and a layer 3 switch as follows - Router 0 interface FastEthernet0/0 ip address 172.17.10.1 255.255.255.252 duplex auto speed auto ! ...
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2answers
78 views

Why can't we have duplicated IPs?

This may be a really dumb question, but I like to turn upside down what I already know sometimes, that way I can learn more. For example, given a network 192.168.0.0/24, I have a device inside with ...
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1answer
34 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
90 views

How to ping router from L3 switch

I am stuck in that that switch can't ping router and router can't ping switch. How to fix that ? I tried so much variants but them didn't help me Actually router must do static routing, that i am ...
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2answers
83 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....
1
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2answers
196 views

Traceroute showing inter-vlan routing?

I currently have two different devices (one server and one client device) that are on separate VLANs (VLAN 5 and VLAN 10 respectively). When the client device runs a tracert to the server, the tracert ...