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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2answers
77 views

Is a datagram from an upper network layer converted 1:1 to one of the lower layer?

I know datagrams from upper layers are converted to those of lower layers by adding metadata, but I cannot seem to find this information anywhere. Which one of the below is correct? A single TCP ...
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1answer
32 views

Multiaccess link shows two Designated Routers in Area 0

I have four Cumulus routers set up with a single ethernet connection from r3 -> r1 -> r2 - r4. From r1, show ip ospf neighbor displays the following: **Neighbor ID Pri State Dead Time ...
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2answers
51 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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1answer
21 views

Why do we need EIGRP AS numbers when we have EIGRP RID?

I understand that the EIGRP routers need to have the same AS number to peer with each other. But why can't we just use EIGRP Router ID?
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Why do Wi-Fi devices suddenly become unable to see each other, while they can still see Ethernet devices, on my low-end router/modem? [closed]

As part of a fiber switchover I'll soon be replacing the ancient Netgear DG834GU ADSL2+ modem + Wi-Fi router I've been using for the past few years. Before I finally retire this old thing (which, if I'...
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2answers
58 views

Is there a way to manage IP space with only a switch?

Is this scheme possible? External provider = External provider of the internet Generally speaking, is there a way to assign a public IP address individually for each server to be used when SFP+ port ...
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1answer
31 views

IP Routing and Switching Interface Speeds

I have a question that relates to routing and switches. I am looking to set up a new Firewall that will handle the routing for the network and attached to the Firewall will be a switch. Here are the ...
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1answer
186 views

What is the difference between Cisco's QoS models and strategies?

I have been reading about QoS and different strategies. From what I understand, Cisco proposes three different models and three different strategies for QoS. For strategies, you can have a 4-class, ...
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0answers
16 views

Ping does not work on TAP interfaces with bridge [closed]

I am trying to understand the linux bridging and local ip rules, I have following topology on my linux laptop. br0 ___________|__________ | | |tap0 ...
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0answers
12 views

Will switching to VDSL2 provide me with a higher speed? [closed]

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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0answers
14 views

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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2answers
7k views

SonicWALL routing and L2 VLANs

We have a SonicWALL NSA 3500, x4 has 2 VLAN interfaces so x4:v300 and x4:v301. Each VLAN has an IP address: v300 is 192.168.100.1, and v301 is 192.168.101.1. I then have x4 connected to a layer-2-...
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1answer
28 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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1answer
57 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
4k views

Packets failed to send to destination in static routing for parallel router topology in Cisco packet tracer

0 down vote favorite Ok, I was trying to connect routers in a parallel topology , as shown in the figure I've configured the IP addresses for the fast Ethernet and serial interfaces. Here are the ...
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1answer
110 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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12 views

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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1answer
39 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
51 views

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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6answers
3k views

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
51 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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5answers
15k views

Difference between routing, forwarding, switching

I feel like the three terms are often used as synonyms but actually all mean something different. I did look at Wikipedia sites but I'm still unsure about the definitions of the three. From my ...
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3answers
48 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
192 views
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1answer
45 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
44 views

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
44 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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0answers
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
49 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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2answers
821 views

How to find a AS-SET of an asn?

How can we find the as-set of asn? For Example I have the asn:32934. I want the as-set?
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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
140 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
24 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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2answers
621 views

How GSM network routes Internet packets?

How does a GSM network route internet packets? Does GSM use NAT based PAT like a physical Router? For example, user A visits website #1 and user B visits website #2. how data of website #1 are given ...
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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
15k views

F5 Routing - Default Route or IP Forwarding Virtual Server?

In the 21st video of the F5 video series in CBT Nuggets, Keith Barker explains that the way to make the F5 "route" is by creating an IP Forwarding Virtual Server. This server would have the following ...
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1answer
137 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
33 views

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
9k views

Trouble configuring pfSense firewall to obtain OSFP route information from attached routers

I am having trouble configuring pfSense to accept the OSPF routing tables of attached routers. Any advice would be appreciated! I have installed the Quagga OSPFd package, but I am not certain it is ...
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1answer
72 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
43 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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2answers
331 views

IGP between 2 routers with an uncooperative router in the middle

I've got two routers, A and B. A gets some routes over BGP over a VPN connection, and has a leg on 10.0.0.0/24. It also can access the whole 10.0.0.0/16 via its default gateway. B is on 192.168.0.0/...
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2answers
83 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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2answers
20k views

Mikrotik RouterOS routing between subnets on local ports [closed]

Site 1: Locally connected to port 1 with interface IP 192.168.1.1/24 Site 2: Locally connected to port 2 with interface IP 192.168.2.1/24 Port 3 is the internet. Master Ports none on all interfaces....
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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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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 ...
2
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1answer
1k views

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 ...