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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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IS-IS as a PE-CE routing protocol

In case of IS-IS as a PE-CE routing protocol for MPLS VPNs , when route is redistributed from BGP to IS-IS , does 'Down Bit' is also set to avoid routing loops?. Background Information We know that ...
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0answers
22 views

Site not accessible through public IP from intranet [on hold]

I'm hosting some sites/services like Jenkins on a server I've got at home. I'd like to have them accessible from the Internet as well as intranet through a public domain name. For this I've registered ...
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2answers
49 views

is it ideal for a network that abandon the use of L2 switch?

I'm thinking about minimizing network hardware while optimizing network topology for company. If a company has unlimited(or very high) budget to build an ideal network for internal use(traditional ...
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2answers
33 views

Connection between two networks with different IPs and identical subnets?

How can we establish communication between two networks with different IPs but same Subnets? Network Connection 1: (Factory Network for machinery) I.P = 192.168.19.X S.N = 255.255.255.0 G.W = 0.0.0.0 ...
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0answers
18 views

How to do IP masquerading on MacOS (10.14+)? [on hold]

I am looking for the equivalent Macos command to the linux: sudo iptables -t nat -A POSTROUTING -o en0 -j MASQUERADE The reason i want to do this is I have a VPN that has the default route, but i ...
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1answer
25 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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0answers
18 views

routing with multiple NICs (connected to multiple APs) that were all assigned the same LAN address [closed]

I have 4 wireless APs based on the ESP8266. These APs all broadcast distinct SSIDs, but each serves LAN addresses in subnet 192.168.4.XXX. The subnet value is not configurable. Then, I have a Linux ...
2
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1answer
55 views

Do unmanaged switches honour QoS priorities set by managed switches?

Details about the devices We have a 24 port NETGEAR managed POE switch that has QoS capabilities. We also have the following unmanaged switches, 24 port Cisco POE, 48 port Cisco, 48 port NETGEAR, ...
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0answers
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Cisco Packet Tracer - How do I connect these networks through a router? [closed]

I am trying to connect these two switches through the router as shown and also correctly configure the wireless router on each network so that they connect to their switch. Basically anywhere there's ...
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0answers
36 views

How to route a specific users IP from WAN to a specific host IP on a subnet OPT1 (pfsense)

I host a game server, Players and Devs use the same launcher/client that has hard coded ports (5555) that cannot be changed. (No Configuration Files) How would I route Devs to the Development Server [...
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0answers
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Edgerouter DNS Redirect Domain Extension to Wi-Fi [closed]

I have an Edgerouter hosting wired traffic on 192.168.1.0/24, connected to a Unifi AP which hosts the WAN on a VLAN over 172.16.0.0/24. I want to set it up such that I can set specific Wi-Fi devices ...
7
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2answers
427 views

OSPF increase bandwidth with load-balancing

This is my current setup where i have 40Gbps links between all 4 switches running OSPF using L3 links between them but now i want to double my bandwidth between switches so i am planning to add (...
2
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1answer
28 views

Bonding and switching between 2 different Links/WANs/Interfaces

Before I ask anything, I'd like to say that I pretty much searched a lot (to what I know of from keywords and terms such as "bonding" "wans" "links" "failover" "aggregate") and I couldn't find any up ...
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0answers
10 views

Managed / Unmanaged Switch [duplicate]

This is a basic question, But can someone clearly state what is the difference between managed and unmanaged switch? Also, do managed switches maintain their own routing table?
1
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1answer
43 views

Connecting networks from different states [closed]

Is it possible to connect 5 networks together using one router as a central component even if the networks aren't close to each other? An example would be 2 networks in Houston and 1 in Dallas Texas, ...
4
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3answers
969 views

RIP Packet Format

I am trying to investigate a RIP packet. It clearly states that the packet is RIP v1. But its format does not match with the either RIP v1 or v2. Any ideas what this packet actually is?
2
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2answers
81 views

No route to host for IPs in same subnet being routed by bgp

I have set up BGP to do some custom routing for a subset of addresses in the range 192.168.1.0/24. I have verified that the BGP is working by testing ping/curl on a different host in a different ...
2
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2answers
76 views

Running iBGP without IGP

Given following setup: Configuration of the routers is very straight forward. Router BGP1: interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Loopback9 ip address 9.9.9.9 255.255....
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2answers
145 views

How to architect a globally distributed website, from an IP address perspective

I would like to have a website that is loaded fast from any point in the world. From my understanding, you need to take advantage of the data center "regions" at places like Google Cloud or AWS. That'...
0
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0answers
8 views

Given an IP address and a subet mask, how do I find the max number of subnets and usable host IP's? [duplicate]

my question is based on an IP address and a subnet, how can I find the maximum number of subnets and the number of usable host IP address per subnet. This is all IPv4 if that helps. For example if I ...
2
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0answers
49 views

RPL: questions on routing mechanism

I'm studying RPL and two questions came to my mind: 1: Both in storing and non-storing modes, if a node wants to send a packet to another node via P2P communication paradigm, then how does the ...
0
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1answer
59 views

How to change AD on Juniper router?

I have this route on my Juniper Router and some destinations have two routes: OSPF and BGP. I want to change the administrative distance for the BGP route so that it will be smaller than the OSPF ...
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2answers
45 views

How does pfSense control network traffic when plugged into a switch?

I apologize for this n00b question, but I'm trying to learn networking to help at a non-profit where the old IT guy is no longer there. They have several Cisco switches and one pfSense instance that ...
3
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1answer
77 views

Public and Private IPs

I wondered if someone could explain this to me. At work we have a firewall that connects to the Internet and has an external IP configured on it via DHCP. The firewall's WAN port connects to an ...
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1answer
68 views

How to explain that a route has two different AS numbers?

I have a question about the AS path, see the below example where I show the route 114.114.114.114. This shows several BGP routes. See the fist route item. The AS path is 4809 4134 I, I want to know ...
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1answer
60 views

What happens in Exstart state in OSPF neighbor state? Will DBDs be exchanged in that state?

According to my knowledge, DBD exchange happens in Exchange state.
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1answer
58 views

Installing a redundant system in parallel routing

I have a legacy automation system which will be replaced by a newer version. As an fallback option, the new system will be installed in parallel to the old one. But only one will be "in control". Due ...
0
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1answer
41 views

Routing in Wireless Ad-Hoc Networks

Let's say I have a mesh of sensors forming a wireless ad-hoc network. If one sensor wants to send data to the sink, it will transmit a packet via WiFi for example. My assumption is that there's no ...
5
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3answers
79 views

Why do all the intermediary routers need to run iBGP without tunneling?

I'm trying to understand the configuration behind iBGP - I understand you can run full mesh to prevent loops, run confederation or route reflectors, if you don't want full mesh, else run tunneling ...
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2answers
48 views

Can you tell whether a device is a gateway or not from its routing table?

When looking at a device's routing table, can you tell whether it is a gateway device between some networks or if it is not a gateway device?
3
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2answers
94 views

Finding a lost device

I have a device - an old printer I think - that is showing up in my traffic flows. It is from a decommissioned subnet (100.100.100.0/24). It is passing one of my network taps and triggering alerts. ...
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1answer
42 views

Is “gateway” a concept between two or more networks or a concept belonging to just one network?

Is "gateway" a concept between two or more networks or a concept belonging to just one network? When a device is connected to two networks, if it is listed as gateway in the routing tables of the ...
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3answers
165 views

Do all network devices need to make routing decisions, regardless of communication across networks or within a network?

From Hunt's TCP/IP Network Adminstration: Gateways route data between networks, but all network devices, hosts as well as gateways, must make routing decisions. Is it correct that routing ...
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4answers
76 views

Does a gateway need to be designated?

Does a gateway need to be designated? I thought a gateway between two networks is a device explicitly designated to be a gateway, out of several qualified devices connected to both networks. That ...
1
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1answer
67 views

Unable to Ping Past Firewall

I am trying to get communication across a firewall, but I am unable to ping anything past the firewall. PC1:172.16.201.22 <-> Router:172.16.192.1 <-> Firewall_Port1:10.10.10.4 <-> ...
3
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1answer
113 views

Advertise all static route except the default gateway with Juniper SRX firewall

With the following policy, all static routes are advertised via BGP to my neighbor: root@Nitrogen# show policy-options policy-statement bgp-export-policy { term export-statics { from ...
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3answers
153 views

Inter-VLAN Routing Issue

As you can see in below diagram regarding the Inter-VLAN between Server (VLAN 107) with The site in (VLAN 104)actually, we can ping all the inter-VLAN on the site. but we cannot browse some of them ...
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1answer
22 views

Can a hub be used for sniffing traffic from a device?

My intention is to analyze all network traffic which is coming to and originating from a network connected device I have. From the configurations of the device I am able to proxy all the HTTP traffic ...
7
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1answer
337 views

What does routing an IP address mean?

From https://stackoverflow.com/a/40189197/156458 Blocking 0.0.0.0 makes no sense. In IPv4 it is never routed. What does "routing" a IP address mean? Why is it the reason that blocking 0.0.0.0 ...
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2answers
75 views

Is static routing used in large networks?

I'm a beginner in networking stuff and just wondered if Static Routing has any use in large networks ? How about small ones ? In which cases we prefer to use static over dynamic routing ? I searched ...
3
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1answer
29 views

EIGRP unequal load balancing, variance command

Is correct to say that the value inserted in the variance command, lets say the value of "2" on a route that has a cost of, lets say "100", will unequally load balance all routes up to a cost of 200 ? ...
3
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1answer
80 views

EIGRP Auto-summary

One more question about EIGRP, EIGRP auto-summary what is the impact on the network ? i was reading about but it was not clear for me. And why is it a good Cisco practice to be disabled ? I am ...
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1answer
35 views

EIGRP metric claculation

I have a question regarding the EIGRP metric system. so if K1 is the Bandwidth and formula is : (K1 * BW + ((K2 * BW) / (256 - LOAD)) + K3 * DELAY ) * (K5 / (RELIABILITY + K4) Whats is BW and ...
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1answer
30 views

Packet tracer - why “show ip route” shows network address

This is just a quick question I am wondering out of curiosity. When I set up a network in packet tracer, why does "show IP route" show the network address (example: 199.120.5.64/27) and not the IP ...
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0answers
40 views

Colocation network setup - 2 switches with each 1 uplink - redundant configuration question

I have a question about the network configuration when connecting 2 switches in a colocation rack via 2 uplinks (1 uplink to each switch) to 2 other switches of the datacenter itself. My topology ...
6
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1answer
274 views

Can non-recursive BGP route be used to determine next-hop for recursive BGP route?

In BGP recursive scenario, the recursive route is taking an unexpected next-hop. Here is the routing table: S* 0.0.0.0/0 [10/0] via 10.10.10.1, wan B 172.16.5.0/24 [20/0] via 172.80.80.1, MPLS, ...
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1answer
56 views

Allowing only routed traffic, block intra-VLAN forwarding

In a mixed network of Dell and HP/Aruba devices, we would like to block all communication between client computers, and only allow them to communicate with servers located on a different VLAN*. There ...
0
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1answer
36 views

What are the differences between packet forwarding and network address translation in layer 3?

What are the differences between packet forwarding and network address translation in layer 3? Is packet forwarding done by a router between two networks that use public IP addresses? Is network ...
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2answers
58 views

Do the Master/Slave Election happen in Broadcast Domain in OSPF? if not Why?

According to my knowledge, Mater-Slave election is needed to decide who will to start communication between two routers. In broadcast domains all the DR other routers communicate with DR. Is there a ...
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0answers
30 views

IS-IS Interface Metric/Cost Calculation Issue in Juniper MX

I am facing a very strange issue with regard to IS-IS Interface Metric / Cost calculation in Juniper MX. We have configured a reference bandwidth of 1000G on all routers.This by definition means an ae ...