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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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how to get a smart phone at home to forward calls to my smart phone through a softphone app and vice versa [closed]

I want to create a system or to know if there is a device that does this. I have multiple sim cards and I don't want to be moving around with many phones. So I want to have a device at home (be it a ...
newtworkinguser091's user avatar
1 vote
2 answers
70 views

Is the routing table a control plane concept or a data plane concept?

I've always been told that the routing table is a control plane concept. You build this table, collect the routes, the way they were learned, their metrics, and so on. You then use this information to ...
Mitrixsen's user avatar
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How to generate the netconf configuration for traffic enginerring with Segment routing from the CLI commands on Cisco IOS XR platofrm

I have below configurations to be pushed via netconf : Router Type :- IOS -XR CLI :- segment-routing traffic-eng segment-list ar4.BLB_ar7.BLB_c_10000_ep_1.2.3.4 index 1 mpls label 24001 index ...
harshit gupta's user avatar
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Is it possible to forward SMTP connections for various domains in the same server to different internal ports? [closed]

I have a server machine. If an incoming connection comes on https://abc.com:443, it's redirected to internal port :81 and if https://xyz.com:443, it's redirected to :82. This works fine. Now I have 2 ...
iammilind's user avatar
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1 answer
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Could address be omitted from packet in IPv4 if router is sending to / from that address?

Imagine an IPv4 packet routed like this: A -> Router1 -> Router2 -> B When constructing a packet per the structure, it seems A will have to include both source address (A) and destination ...
Mario Ishac's user avatar
1 vote
1 answer
49 views

Nested Network with same IP Space

I have a router (Teltonika RUT) that is connected via its WAN port to a network (let's call it "Big"). The IP Space of the "Big" Network is 192.168.1.0/24 with the Gateway on 192....
bgc's user avatar
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2 answers
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Connecting two different networks behind different firewalls [closed]

I have two LANs in the same building with different ISP and both behind different hardware firewalls connected to a switch like in the first picture bellow. Before, both LANs were connected through ...
p.kirkovski's user avatar
2 votes
1 answer
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OSPF - is the Designated Router the same thing as the Master Router?

Is it possible, to have a DR as a Slave Router? So here is my knowledge: The DR and the BDR are elected based on priority and then highest RID in an area, so every router can communicate with the DR ...
Bog's user avatar
  • 131
2 votes
1 answer
62 views

How does the final next-hop router forward a frame to the destination device if the public IP address is that of its router

We know that all device’s connected to the same local network will have the same public IP address as each other, which belongs to their local router. So, since the IP packet’s destination address is ...
user94393's user avatar
3 votes
1 answer
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Computers on different subnets can't talk to each other

I'm teaching an introductory computer engineering course in HS and had students in the lab network together the computers they built in the hardware unit - I appreciate the irony of somebody teaching, ...
Jawsont's user avatar
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intervlan routing on cisco L3 stacked switches

I am new to this and I am having a bit of a issue trying to successfully perform intervlan routing on a stacked L3 switche(s). I essentially have three SVIs with their corresponding VLANS ( i think) ...
Tormentium's user avatar
-1 votes
1 answer
64 views

Why MLS2 Doesn't Get ICMP Packet To Where It Should?

This is a Packet Tracer lab from Kieth Barker's website with minor modifications. It is intended to exhibit how can we get to the network 10.10.0.0/24 access to the Web Server 23.1.2.2/24 Using NAT. ...
Shadi's user avatar
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1 vote
2 answers
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One Shop, Two ISPs. Will this work?

My retail shop uses Comcast Cable (calling it CC going forward) as the ISP. I just added Verizon 5G Business internet (calling it VZ going forward) as the backup for the times when CC is down (which ...
RA2024's user avatar
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6 votes
3 answers
686 views

Can ARP tables store addresses for other networks?

This is perhaps a weird question, but I'm in a weird situation where I want to route traffic from network A 192.168.1.0/24 to network B 192.168.2.0/24 via 192.168.1.5 (the address of B-router in the A ...
TrisT's user avatar
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1 vote
1 answer
65 views

Cisco BGP RTBH in EVPN fabric

I have Cisco basic EVPN fabric configuration in DC with two spine and couple of leafs using OSFP+iBGP for underlay fabric. My border leaf connected to my ISP using Vrf CUST. I want to configure RTBH ...
Satish's user avatar
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1 answer
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iBGP exchange all routes?

1.1.1.0/24 1.1.1.0/24 [community 100:1] [community: 200:1] [as path 100 300 500] [as path 200 500] eBGP peer (AS100) eBGP peer (AS200) \ / \ ...
krdx's user avatar
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0 answers
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answer code block juniper table routage [duplicate]

want some one expert juniper help me for this question user@router> show route 192.168.100.2 inet.O: 15 destinations, 17 routes (15 active, 0 holddown, 0 hidden) Limit/Threshold: 1048576/1048576 ...
Marghli Dhikra's user avatar
2 votes
2 answers
79 views

STP related question

Hi this is a portion of my current set up.. All vlan ports are untagged. Everything works and communicates fine until a connection is made between the 2 switches it takes down the network and the pc ...
Blake's user avatar
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1 vote
0 answers
200 views

Trouble configuring BGP policy 'next-hop self' in JunOS

Networking Community, Problem: I am struggling with applying the correct BGP “next-hop self” policies in JunOS. Background: I have been brushing up setting BGP policies, e.g. ‘direct’, ‘next-hop self’,...
dynamicruss's user avatar
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1 answer
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Why is there overlap with two interfaces?

I am trying to configure router0, I assigned ip 192.168.26.1 to gigabitEthernet 0/0 and I tried to assign this ip: 192.168.26.33 to interface serial 0/0/0 but this error appears: 192.168.26.0 overlaps ...
mohdh34m's user avatar
0 votes
1 answer
79 views

Static route weird behaviour

Hi, I am working with 4 routers: A B, P and C A and B have a P router between them that has an ospf neighborship with both. B is directly connected to router C. There's no routing protocol between B ...
V Dp's user avatar
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1 answer
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Public wifi router conflicts with company VPN IP address [closed]

I'm a digital nomad and I like to work in cafes and co-working spaces. The problem is that sometimes the network router IP address conflicts with my company's VPN-client IP address. Any and all ...
Nick Bonilla's user avatar
0 votes
1 answer
50 views

How to access SVI from the other side of a tunnel? [closed]

With two vlans separated by an IPSec tunnel, I'm having issues reaching an SVI on the far end. Hosts on either end can ping each other without issue, but the SVI's do not respond from the far end, ...
chrismec's user avatar
2 votes
1 answer
139 views

which protocol is invoked first by routers ? routing (routing table) or ARP?

I have a question regarding the internet layer of the TCP/IP model: When a data frame is sent by a client to a server located on another network, we know that the routing tables and the ARP protocol ...
Ali's user avatar
  • 33
1 vote
2 answers
110 views

Can the Cisco SF302-08 switch support IP routing capabilities?

I'm currently working on configuring inter-VLAN routing on a Cisco SF302-08 switch. I've already enabled Layer 3 routing, created the VLANs, assigned them to switchports, and configured the switch ...
mema's user avatar
  • 11
2 votes
2 answers
72 views

what information needs a router to make a decision?

How does a router that receives a packet know what to do if it doesn’t know the subnet mask of the IP that sent the packet? The reason for asking this is that I didn't see any field in the IP header ...
netuser2024's user avatar
1 vote
1 answer
60 views

Why will specifying the outgoing physical interface work for a static route with IPv4 and not for IPv6?

When setting up loopback interfaces with IPv6 addresses with static routes between two directly connected routers through their interfaces. It does not work to specify it with the outgoing physical ...
Calvin Broadus's user avatar
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2 answers
62 views

IPv4 Address space for PTP links

I operate a relatively small ISP (around 1k households). We have passed the stage where a single router does not cut it anymore. As a corollary, we have to link routers to each other. For this, we've ...
Aloha's user avatar
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0 votes
1 answer
113 views

In a trace route, do routers that do not respond still forward the packets?

In traceroute, The sender expects a reply within a specified number of seconds. If a packet is not acknowledged within the expected interval, an asterisk is displayed. Pasting here the example trace ...
Noob_Guy's user avatar
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0 votes
1 answer
94 views

Problems with twice-NAT on Cisco 3548

I'm trying to get Twice-NAT working on a Cisco 3548 switch. I have a VRF set up with 2 L3 ports on it - Eth1/33 has ip address 20.20.255.250/16 and is nat inside Eth1/34 has ip address 10.10.1.211/24 ...
Kevin's user avatar
  • 101
0 votes
1 answer
98 views

Can't ping between cabled interfaces on different VRFs on same switch (Cisco 3548)

As an experiment I've created a non-default VRF, directly cabled between an L3 port on the default VRF and an L3 port on the non-default VRF, and am trying to ping between them. Neither interface can ...
Kevin's user avatar
  • 101
0 votes
1 answer
162 views

Two switches connected to VyOS router - nodes connected to the second switch can't send or receive packets

I'm using VyOS 1.1.8. I am having following set up in GNS3: Devices connected to Switch1 are working properly. PC1 can ping PC3 and vice versa. They can obtain IP via DHCP. PC2 can't be pinged even ...
Chicken McNugget's user avatar
1 vote
2 answers
253 views

what is the purpose of GRE in UDP encapsulation if its unidirectional

I was going through this feature of GRE called GRE-in-UDP encapsulation. The RFC says it is unidirectional and the tunnel traffic is not expected to be returned back to the UDP source port values used ...
RootPhoenix's user avatar
1 vote
1 answer
98 views

BGP: Are Virtual Internet Exchanges more efficient than normal internet transit?

There are a number of virtual internet exchanges that BGP peer over VPN links when local presence is not available. Given the IP encapsulation overhead, and the fact that these routes still cross the ...
KJ7LNW's user avatar
  • 167
0 votes
1 answer
39 views

Is route from traceroute guaranteed to match the route packets will take in actual usecase?

Context I'm working on a university project where I need to find out if it's possible to save electricity by hosting services locally and thus having to transmit data by smaller distances. I've ...
mcv_dev's user avatar
  • 103
1 vote
1 answer
77 views

Rip Routing Protocol

RIP routing protocol use the distance vector routing algorithm that mean each router will share the distance information,But how can this distance information help the router to know where to forward ...
Darevil294's user avatar
0 votes
1 answer
90 views

How can I have multiple servers and IPs if I only have 1 ip with gigabit connection?

I have 1 gigabit connection with static public IP address... Without depending on my local ISPs colaboration, is it possible to buy IPs from an online service and route each individual IP to my local ...
adrianTNT's user avatar
  • 101
0 votes
1 answer
77 views

OSFP anycast route different area

So.. lets pretend i need to advertise a route in anycast to the backbone, obviusly same route that in this case is 192.168.1.111 . Can be a problem if the routers that advertise that route to the ...
d0x0p's user avatar
  • 1
1 vote
1 answer
286 views

How can I implement BGP between two routers that have already been configured with different routing protocols?

I have two different AS with different IP ranges and subnets, and the first router stack is running RIP, and the second one is OSPF. I want to configure BGP between "Router-PT Router23" and &...
zeel's user avatar
  • 11
-1 votes
1 answer
41 views

ISP ARP tables and routing [closed]

So I'm Network+ certified and have a beginners understanding of how network communication works, my head starts to split a bit though when I think about how the information is actually communicated ...
user1047228's user avatar
1 vote
1 answer
237 views

Who/What is AS4100000000?

I have seen AS4100000000 in some routing datasets I am working with, for example Routeviews: 194.153.134.0/24 AS4100000000 I would like to understand where it is coming from or who controls it so I ...
fjahr's user avatar
  • 133
0 votes
1 answer
47 views

2 Routers for PPPoE and NAT 5 Public IP [closed]

My ISP have provided me with 5 Public IPs. I tried to NAT these 5 IPs to our local server by using this setup. The primary router will be setup for the internet connection while the one-to-one NAT of ...
Renivle's user avatar
0 votes
2 answers
291 views

If the destination MAC is changed every hop. When it arrives at the destination router, how will it know which device to deliver the packet to?

I learned that inside a packet there is information about the sender's public IP and MAC and the receiver's public IP and MAC, and that at each hop, the sender's and receiver's MAC are changed along ...
Brasley's user avatar
0 votes
1 answer
97 views

Networking across campus with multiple ISPs

I currently have a campus that gets service from two ISP's that are each connected to their own router. The ISP's ingress and their routers are in different buildings on the campus. The buildings are ...
MRR's user avatar
  • 1
0 votes
1 answer
85 views

Geolocation specific ASN

question: is it possible to determine the geolocation of a city/region of a specific ASN? For example, Telecom Italia has many ASNs. Is it possible to know for each one "which soil" they ...
vincenzogianfelice's user avatar
2 votes
2 answers
756 views

Can LACP connect to 2 different firewalls?

I'm in the process of redesigning my network and have a few questions about LACP configuration: Can LACP be set up to connect to two different firewalls? In the diagram I provided, there are three ...
kevin's user avatar
  • 33
0 votes
0 answers
40 views

2 Cisco ASA Firewalls - TCP SYN FLOOD

Problem We have 2 firewalls, a DMZ firewall and another firewall named FW1 in a testlab. Both are CISCO ASAs. The shared services and jumphost are behind the FW1 firewall. The 172.28.208.0/24 subnets ...
Kal's user avatar
  • 1
1 vote
1 answer
52 views

Import route from one rip group to another

Just started out with RIP implementation in juniper routers. Was not able to find much info on the following points. Any help is appreciated. I have defined 2 RIP groups, both in the same routing ...
host_unreachable's user avatar
4 votes
2 answers
670 views

must an IPv6 router have an IP address in the SLAAC prefixes it's advertising?

for example: i have a router with the lladdr fe80::1/64 on interface e0. the router is configured to advertise the autonomous, on-link prefix 2001:db8:1:1::/64 in RAs on e0. must the router have an ...
unixwitch's user avatar
1 vote
1 answer
89 views

How to configure OSPF to create desired routing paths?

Is there any way to assign OSPF cost so that when is traceroute 147.147.11.98 from R1 it goes like R1->R4->R5->R2 and when I traceroute 147.147.11.98 from R5 it goes like R5->R4->R1->...
Rakesh Kr Yadav's user avatar

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