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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Will switching to VDSL2 provide me with a higher speed?

Currently my ISP has offered me to switch from 16mbps ADSL2+ to 70mbps VDSL2. I would like to know if I switched how much of the 70mbps will I be able to receive. Those are my current ADSL2+ details. ...
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OpenVPN - site to site question [closed]

I have 2 networks and I want to build a VPN tunnel between these networks. Currently this is how it looks like: On the main side, the vpn server is on its own linux device separate from the router! ...
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subnet masks with different networks with packet tracer [duplicate]

Iam beginner in dealing with routing and networks i have designed a network using packet tracer i have used the default 255.255.255.0 My question is How i can design the subnet masks for every ...
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ARPs passing through VLANs [closed]

I am using a switch chip (KSZ9897) with DSA linux driver. I have configured a bridge with vlan_filtering enabled: ip link set dev br0 type bridge vlan_filtering 1 Each interface on the bridge is on ...
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1answer
30 views

Access a device connected in another switch

I have theses two switches, 3Com 4500 and 3Com 2928. 3Com 4500 - IP: 20.20.X.X ; Mask: 255.255.240.0 3Com 2928 - IP: 192.168.1.X; Mask: 255.255.255.0 There is a printer(20.20.2.1) connected in the ...
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2answers
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Same /24 IP prefix, same AS for 2 different locations, possible?

Let's say I have 2 locations: 1. the United States Datacenter 2. the Russian Federation Datacenter I have 1 /24 Subnet with 1 AS. Both sites have a different ISP. My target is to: allocate /24 for ...
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1answer
11 views

Send response packet when they are multiple routes available? [closed]

Hey guys this is my first networking question , i'm kinda a noob so be nice with me . So i have this network scheme that i have to do : All these network interfaces need to be able to communicate ...
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FRR: AIGP or similar round-trip-based route selection for BGP [closed]

Given the configuration: A <-> C A <-> B <-> C A <-> D <-> C Assume the link from A to C is extremely unreliable for some reason, such as a faulty cable. Or, it is ...
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3answers
45 views

TTL And Wildcard mask

I have two questions that i wanted to ask before. What is TTL?! I know that it's time to live for packet to die it count how many hops you jump in it every icmp but i don't know how it works and what ...
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1answer
47 views

Fortigate and ipv6 routing

I have a Fortigate router and my ISP support ipv6. I'm getting a public ipv6 on the Fortigate and also on the computers on the lan (2a02:a18:9041....) I have not to much understanding of ipv6, but by ...
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6answers
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packet routing between subnets on same vlan

I am trying to understand how packets are routed within the same VLAN. I understand that typically there should be a 1:1 mapping between VLANs and Subnets. However if i deploy the following ...
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1answer
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What are Cisco Devices? [closed]

I am doing CCNA online and not for a minute have I not failed to come acroos the statement 'Cisco Device' What exactly are cisco devices ? Please don't tell me 'Devices that use Cisco iOS' Can you ...
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1answer
42 views

How to check the route table on a neighboring router?

I have a router in a network, which use to show list of routes in the route table. Using the command- show ip eigrp topology I see some of the routes are removed after sometime, which were advertised ...
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9 views

How to subnet correctly? [duplicate]

For an organization having 5 departments with less than 256 devices per department and IP address pool 172.16.0.0/16. what is the correct approach for subnetting? 1. should 4 bit be borrowed to ...
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1answer
45 views

BGP local-as command clarification

On my network infrastructure, an Arista switch is the core switch and a pfsense server the gateway. BGP is used to advertise routes for all the internal networks. On Arista switch, I see the BGP ...
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1answer
32 views

Unicast Adjacency Routes Nexus (AM) Cisco Nexus

I have an odd situation. There is static route on my Nexus 7700 that routes anything for specific subnet /24 to a F5 LTM Load Balancer, external VRRP interface 10.x.153.15. As you can see below, ...
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2answers
138 views

Industrial Ethernet network design

looking for some advice on network architecture for an industrial switchroom with several constraints. Modbus TCP devices are located in motor control centre cells, these need to connect to the ...
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0answers
38 views

Strange traceroute behavior when using iptables/nat to redirect an IP [closed]

A client of mine has a network 10.0.1.0/24 that has the following systems (among others): 10.0.1.254 Main router 10.0.1.4 Linux server 10.0.1.8 Windows server   The windows server ...
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1answer
22 views

Bandwidth limit between CPE and Provider Equipment

I have 4 different WAN links for redundancy one of them is 15mbps MPLS and the other ones are 30mbps Internet , 50 mbps Internet and 10 mbps MPLS , the way that it is set up is that we have load ...
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1answer
25 views

Can't access services on my other IP on same network interface GNS3 and Host

I have one physical NIC that is assigned an IP address (10.14.255.240). Inside of GNS3 network simulation tool, I also have a another 'virtual' interface with another ip address (10.14.255.245). Both ...
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5answers
2k views

Is policy routing bad?

I heard that network engineers tend to avoid policy routing. I am thinking to source-address dependent routing for example. Is policy routing bad practice? If so, why?
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1answer
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OSPF: What's the consequence of two nssa area translator router

If NSSA area has 2 ABR, then usually one of them will be elected to be translator by router id. But what if I have 2 translator routers and both translate the message simultaneously? How to route in ...
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1answer
59 views

How does the BGP UPDATE message propagation work?

I am currently reading about Routing around Congestion Defense and the non feasibility of this approach. Since to use this method a lot of BGP poisoning would be necessary and to switch paths several ...
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1answer
44 views

LAN to WAN IPv4 address mapped to LAN server through NAT Rules or other

I need to set a rule that allows me to connect BOTH from OUTSIDE the LAN (from the "internet" to the Internal server at IPv4 address 10.64.0.50 via port 22, by running ssh://1.2.3.4 -p 22; AND From ...
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1answer
54 views

EIGRP Holding Time Expire on VLAN Interfaces

I configure 2 Layer 3 Switches with VLANs and EIGRP route. But it always return a message like this : %DUAL-5-NBRCHANGE: IP-EIGRP 2019: Neighbor 192.168.20.253 (Vlan20) is down: holding time expired ...
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1answer
71 views

Cannot Connect to one single ip address in VLAN

I have 3650 Switch which contain number of VLAN and I am unable to connect to one ip address from specific VLAN. But routing is properly configured and there is no ACL applied. Even end device has no ...
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2answers
142 views

How does aggregate routes behave in BGP?

If a router received two BGP updates for the same prefix and both these updates are aggregate paths how do the router decide which one to take? Let us say that it needs to decide based on AS Path ...
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2answers
82 views

Cisco Catalyst 9410 - Using Default Gateway versus ARPing for locally connected host

I may be missing something extremely simple here, but im at loss trying to figure out what this Nexus switch is doing. Here is the topology: DISCLAIMER! I had made a mistake on the diagram by ...
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1answer
27 views

IPSec point to point Cisco 2800 to Palo Alto firewall

Is there a way to use a cisco 2800 router to create a point-point tunnel to a Palo alto 3020 firewall with support for 6 vlan's on the cisco side. I want to create a tunnel from a new office to my HQ ...
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3answers
69 views

Access a pc web service with different ip/mask in on-site network

I tried to get a setup working to make the following scenario work: Access a pc web service hosted in a different IP range/mask than the rest on-site PCs. Details: We have a network setup with a ...
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1answer
38 views

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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21 views

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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2answers
78 views

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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1answer
40 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
22 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
40 views

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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0answers
11 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
23 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
133 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
24 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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2answers
43 views

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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0answers
41 views

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
35 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
31 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
24 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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1answer
41 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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0answers
57 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
41 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
56 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 ...