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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Hostname routing with fallback IP [closed]

I just set up a new FreeNAS server, with a 10Gbe network card with two ports. One port is connected to the router for access through the network, the other is connected via a 10Gbe ethernet adapter to ...
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350 views

How to block advertisement of a prefixes recieved from 1 BGP neighbor to another

I have a eBGP topology as follows: RTR1 ------ DUT ------ RTR2 (AS100) (AS200) (AS300) I do not want any routes sent by RTR1 to be advertised into RTR2 by DUT I do not know what exactly the ...
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How can I route all Ethernet traffic to a serial port on a Linux system? [closed]

How can I route all Ethernet traffic on a Linux system to a Serial port and the opposite? I want to convert from the first architecture to the second one, as shown in the picture below: I monitored ...
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Other VLAN can access Switch GUI when a pc is connected to a management port [closed]

Not sure how to ask this properly or search for it. I currently have a SG350x switch with 3 vlans (10,20,355) 10 is free for anything but shouldn't be able to access anything else. 20 should have ...
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IPTABLES NAT not properly forwarding SIP? [closed]

I have a SIP server behind a NAT firewall. The SIP server in configured correctly, and can receive calls locally. We recently integrated with Twilio for an Elastic SIP trunk. Calls will sometimes go ...
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143 views

Difference between SVI and subinterface

Modern multi-layer switches seem to support both SVIs (switch virtual interfaces) and subinterfaces concepts. Both are virtual layer 3 concepts used to perform routing functions and some equipment ...
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2answers
56 views

What is exact meaning of broadcast network in OSPF?

According to rfc2328(OSPFv2), broadcast network is "Networks supporting many (more than two) attached routers, together with the capability to address a single physical message to all of the ...
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2answers
161 views

Is it possible to filter directly connected networks redistribute with BGP based on a peer basis?

Assume a simplified case in which router R1 is connected to two BGP peers: one eBGP peer and one iBGP peer. Is there a possibility to advertise directly connected routes only to one of them ...
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10 views

Embedded WiFi access point and mesh on single radio [closed]

After beating my head against the desk for about a week I am still amiss in trying to find a solution to my particular problem, so I am pretty sure I'm either doing this entirely wrong, or somewhat ...
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3answers
62 views

How the device chooses between multiple DHCP pools?

In a router , you can create and configure multiple DHCP pools each one with its own default route and dns server . And because the DHCP pool configuration is not specific to an interface in a router, ...
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Routing or forwarding unsolicited packets back to source - as a way to mitigate nuisance traffic?

I've identified a particular IPv4 /24 subnet that is responsible for a great deal of the unsolicited packets being rejected by my router (and making my log files larger than I'd like them to be). As ...
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Site to site ASA Routing question

I am doing a lab about DMVPN and Site to Site ASA integration. There is no problem in the DMVPN. However I have problem in establishing route from Site to Site ASA to DMVPN. The router on the left is ...
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39 views

Routing infrastructure doubt. It is a functionally design this?

I have design the following network diagram, but I cannot figure out if it could cause some issue on the network: Some detail about the infrastructure: Network connect Ext rtr A, Int rtr B and C is ...
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Dual WAN with each ISP in a VRF - Cisco IOS

I have a DMVPN spoke router setup almost identically to the spoke configuration listed here (Also quoted below): https://www.cisco.com/c/en/us/support/docs/security-vpn/dynamic-multi-point-vpn-dmvpn/...
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74 views

Routing Protocols and sharing information

I am running multiple Protocols on different Routers as so: R1-RIPv2 EIGRP OSPF R2-OSPF and RIPv2 R3-RIPv2 and EIGRP R4-EIGRP and OSPF This is not a practical exercise, it is just to explore how ...
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3answers
59 views

What kinds of organizations use routing protocols (aside from ISPs)?

I don't understand why would an organization aside from an ISP even use routing protocols. Let's say there is a big company with 5000 employees, and they want to have a network throughout their ...
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52 views

Cisco BDI not Forwarding L2 Traffic?

I'm new to interface bridging, and I have an ISR4431 running 03.16.04b.S on which I need to bridge between two interfaces for two hosts: One interface is connecting directly to a host, the other to a ...
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163 views

Testing Secondary Static Route

I am in the middle of migrating to a new IP scheme. From 192.168.10.x/23 to 10.6.x.x/19. Our ISP handles layer 3 and we statically route from our L2/L3 Cisco 3750G switch stack to their L3 device. ...
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How to redistribute BGP routes learned from AWS in one VR into another BGP running in another VR in Palo Alto firewall?

I have about 1000+ prefixes I am learning from AWS on Palo Alto through a BGP. This is on the secondary VR. Main VR is where my core routing is situated along with another BGP instance pointing to ...
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27 views

Ping responses to the Gateway

Last week, I have experienced a strange scenario with Adtran NV3448(a router) and an ISP circuit. Adtran is a similar company like Cisco, also makes networking equipment such as Router, switches, etc. ...
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43 views

Access IPSec site from another IPSec site

Our company delivers, installs and maintains custom build hardware at customer sites. In all cases the delivered setup contains at least 1 server and 2 network devices. To keep the control over the ...
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1answer
28 views

Make eBGP and iBGP equal in Juniper MX204

Apologize for the dumb question, I come from the server world. Our network admin is on holiday and I'm filling in. For the sake of simplicity, we have a fairly symmetric traffic pattern, what goes up ...
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2answers
30 views

How does ISP service cancellation work? [closed]

I'm learning about networks, and so far the more I know how computers and routers are connected, the more doubts I have. I understand I'm plugged via ADSL to my ISP's routers and servers, however, I'm ...
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3answers
313 views

Routing between completely separate private networks

I’ve got a request from a partner vendor in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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OSPF Router ID election query [duplicate]

I have a query regarding ospf router id election. Suppose I have a router with 3 connected interfaces. 10.1.1.0/24 11.1.1.0/24 12.1.1.0/24 I have enabled ospf area 0 on network 10.1.1.0 and 11.1.1....
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answer packages rejected between mangle/prerouting and nat/prerouting

I am currently configuring a ubiquity edgerouter for our network. We have one uplink port (eth2) and two internal ports (eth0; with vlan 1) and eth3 (with vlans 2,3 and 4). uplink and vlan 1 have ...
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1answer
46 views

Routing failed after define static route on core switch

Current connection path: 10.40.20.0/24 desktop <-> access switch <-> core switch <-> 10.30.15.33 NAT firewall for internet access Objective: adding additional path as following to ...
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1answer
47 views

Simple VyOs Static Routing on GNS3

Sorry for the beginner question. I'm trying to simply set up static routing on this GNS3 topology. Specifically, I want Sam to be able to ping Jack. I've assigned all of the VPCS machines ip's, and ...
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89 views

How does a router decide what route to forward a packet when routes come from different routing protocols?

I'm a little confused. I know how the best route makes it to the routing table, but what process does the router follow to choose a path to forward a packet if, for example, you have something like ...
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1answer
29 views

Heading off to college - need help engineering a way around campus ethernet restrictions [closed]

This is all a bit outside my area of expertise, and to be honest, i'm not even sure its possible. My roomate and I both have raspberry pis scraping data in fixed intervals that need to operate over ...
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139 views

How are different phone/GSM operators connected with each other?

This might be a noob question, but I am having trouble finding an answer to it. Let’s say I am a new GSM operator. How would I go about connecting my network and my subscribers to the rest of the ...
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Cisco: NAT overload does not work on Serial point to point interface /32 address on Cellular modem

I have a LTE modem installed in a Cisco 1921 that is able to connect to the carrier network and ping out sucessfully from the router, however NAT hosts are not able to connect to the internet. There ...
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1answer
92 views

Destination NAT on Cisco ISR

I know how to perform regular overload PAT in my lab running sh ver Cisco IOS XE Software, Version 16.03.09 Cisco IOS Software [Denali], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.3.9, ...
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55 views

Cisco ASA 5506: Adding two public IP's that are on the same subnet for the primary and backup interface

Im programming a Cisco ASA 5506. I need to add a primary (public) IP that is x.x.x.82/24 and a backup IP that is x.x.x.81/24. The ASA wont allow me to do this as it gives me an error: "the IP ...
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2answers
96 views

Working in packet tracer, can I configure two routing protocols

I am working on network lab designing topology. I am able to configured two routing protocols which surprised me. I configured RIP and OSPF routing protocols in layer3 switch and advertised same ...
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29 views

Issue with PIM-SSM Multicast Configuration ISR4431s

I have an issue with my PIM-SSM multicast configuration using ISR4431s.    I am wanting to forward broadcast data from an application from one VLAN in on the multicast source to another VLAN on a ...
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13 views

How does IP fragments assembled when identification number field is too small?

Please take reference from this question. It is said in RFC 6864 that if IP V4 IDs remain unique during MDL, it would limit speed to max 6.4Mbps. Now high speed devices generate data at a much higher ...
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2answers
48 views

How do I enable communication between hosts on two Intranets with different routing protocols

Having completed the Networking Essentials Course from Cisco Networking Academy, I've been practicing on Packet Tracer until I came across this scenario. Supposing we have two intranets, A and B. ...
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28 views

why SLA Track 8 isn't applicable to my ISR Router

On a Cisco ISR 4451 I configure SLA Function as follow: track 8 ip sla 1 reachability ip sla 1 icmp-echo 10.1.1.81 source-ip 10.1.1.80 ip sla schedule 1 life forever start-time now And then I want ...
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34 views

Flapping MAC address issue on the uplink routed port

The scenario is like, in my VLAN 30 network, randomly one device stops communicating and when I check the Cisco L3 Stack switch, it shows the following error messages: Jul 27 13:59:55: %SW_MATM-4-...
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1answer
80 views

OSPF route advertising same subnet in same area 0?

Now: SW02 currently running OSPF area 0 with redistribute connected subnets which includes VLAN10 with another router/switches which isn't in the picture and not in the scope of this question; VLAN10 ...
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1answer
85 views

NX-OS 9.3: ECMP polarization and “ip load-sharing … rotate”

This is a "why and how exactly does this work" question. The given problem is already solved. QUESTION: I'm interested to understand what "rotate" in ip load-sharing address source-...
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1answer
45 views

What's the point of aggregate routes when the default preference is reject?

studying for my JNCIS-SP and finally digging into the minutiae. I'm trying to grasp the default behavior of aggregate/summary routes. Why are these a reject? Maybe I'm just using them wrong, but here'...
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1answer
50 views

Some mobile clients are unable to connect to UniFi AP mysteriously

We have two UniFi Controllers, one contains the main internet its directly connected to the fibre and then we give internet to the second controller using LAN connection, internet works fine in main ...
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1answer
28 views

routing a network with 2 interfaces and vpns [closed]

I'm pretty inexperienced in network but here is the idea of what i want to do: I have 2 interfaces: Interface #1 = fast internet Interface #2 = stable internet with static ip address this is the ...
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23 views

Real world IP routing on the Internet [duplicate]

I used to think the Internet looks like a tree, with some extra edges for redundancy. And that the subnets are getting shorter and shorter as you go up towards the backbones, the roots of the "...
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1answer
62 views

BFD issue with BGP support on Cisco 9396PX

I have following BGP configuration and trying to reduce my convergence time with help of BFD but having hard time. router bgp 1111 log-neighbor-changes address-family ipv4 unicast network 22....
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2answers
77 views

EIGRP advertising of routes for other networks behind us

Continuing my expedition in to trying to learn EIGRP and other routing techniques in GNS3, I now have another theoretical network, depicted below: Everything in the red area is a mystery. We do not ...
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2answers
28 views

What is the need for the NEXT HOP coloumn in the routing table when we already mention the OUTGOING INTERFACE in another coloumn?

If the OUTGOING INTERFACE is already mentioned in the routing table, it is natural that the next hop will necessarily be the router attached to the outgoing interface. Then why is there a separate ...
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1answer
41 views

Routing between two sites using FTTC Broadband and E-Band Wireless

I have two sites, both with 80/20 FTTC broadband connections that terminate at the standard white box BT modem. The connections both have fixed IP. I’d like to connect these up to each other and form ...

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