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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216 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 ...
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Why can't devices in different subnets talk with each other?

I know that the layer 2 doesn't understand IP, and the broadcast domain is same. Why can't devices talk, how does it happen?
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How to set vlanif routing on L3 switch between Google Nest and wired network [closed]

I've just added Google Nest Wifi Mesh, and plugged it into my existing L3 switch which has a number of other house devices on it (PC/tv etc.). Wifi works fine, has internet access etc., my problem ...
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1answer
158 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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Best way to make a network failsafe?

I have a Debian based machine with 2 completely different network interfaces from 2 different ISPs acting as a backup for my server connection. These have two different IPs (Let's say IP1 and ...
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How to make devices on different subnets connect via a main router? [closed]

Alright. The configuration is like that: I have a modem from the ISP connected to a main router A (Linksys-WRT3200AC) All devices, printer, network drive are connected to router “A” LAN or wireless, ...
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4answers
410 views

Is Longest Prefix Matching(LPM) Done in Data or Control Plane?

I have a strong confusion on this whether LPM is done in Data or Control Plane. My thoughts on this is as follows if its in data plane, we will have to do it for every packet hence we will have a ...
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2answers
37 views

How can I tell which prefixes are being advertised?

Forgive me if this is a dumb question but I'm relatively new to the carrier networking world. We own a block of IP addresses, say a /18 and we advertise various /20s, /24s, /23s, etc all over the ...
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2answers
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rpd random path selection does not work in Juniper vMX

I read a Junos documentation which said that: In case of equal-cost paths for the same destination, the routing protocol daemon(rpd) randomly selects one of the available paths to balance load, while ...
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Vigor 2862 - Forwarding traffic from branch office to Azure via VPN [closed]

I have a head office router (Draytex Vigor 2862) with an IPSec VPN connection to a MS Azure vNet, and a second Vigor 2862 at a branch office connected via an IPSec VPN to the head office. I can ping ...
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4answers
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Inter VLAN routing working, but VLANs can't access Internet

i have a question/problem. i have a local router with default-gateway 192.168.3.254, now on my layer 3 switch 3560 i configure 3 vlans. vlan 10 - data /ip address 192.168.10.254 255.255.255.0 vlan ...
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1answer
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Joining two networks together with a Mikrotik [closed]

I would like to join two networks together so I can access each device across both. I have a Mikrotik router I would like to use. Can anyone please assist in how to configure router to accomplish this....
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What is my ISP doing or not doing that is causing these problems? - advanced networking help [closed]

I'm not sure if this is where I should be posting this question or if it's the right type of question to ask here but here goes. I'm from Singapore and my ISP is called SingTel. It's was the national ...
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3answers
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Are there any alternative devices to routers?

I am not talking about the router used at home to access Internet . I am talking about devices used in the network core. I want to know if there are alternative devices, if any, used for forwarding ...
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1answer
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Tunneling a SOCKS5 proxy through localhost with port [closed]

This might be a broad question, but is it possible to tunnel a socks5 proxy through a localhost port? For example: I want to use localhost:4040 to connect to 66.x.x.x:1080, basically reroute all ...
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1answer
23 views

What is route leaking?

I tried googling, but didn't find a good article explaining this. What roughly i understand it, advertising route from one vrf table to other. What type of routes (static, connected, dynamic routes) ...
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3answers
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Juniper EX how to clear route forwarding table?

After layer 3 routing a large IPv6 assignment on an EX Juniper switch, the route forwarding table filled up and some entries corrupted or became otherwise invalid. We want to clear the whole table. ...
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2answers
2k 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
55 views

BGP Route Reflector

In the following configuration, INTERNAL1 and INTERNAL4 are RR and INTERNAL2 and INTERNAL3 are clients. I am not able to see the routes 20.1.1.0 and 10.1.1.0 on INTERNAL3 and 30.1.1.0 and 40.1.1.0 on ...
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4answers
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Active\Passive Routers w\ BGP

What I'm trying to do is take two routers, "A" and "B" where 'A' is the primary router. Just like with active\passive firewalls and HSRP I want to "float" the default gateway between either Router A ...
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1answer
54 views

Cisco router on a stick with public ip wan (ISP)gateway

I am trying to create a router on a stick with an outside facing sub-interface with a public IP from an ISP. I have tried to configure NAT and routing but I just cant get to ping the internet. I'm ...
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2answers
23 views

Who owns the in between routers displayed when I execute a traceroute command?

When i traceroute a website, i get the IPs of all the routers in the path between me and the website. Who owns all those routers? Are they organized in a particular kind of building?
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Is it possible for a routing loop to form using ADOV (Ad Hoc on Demand Distance Vector Routing) if there is a corruption in the sequence number?

I know that the sequence number prevents routing loops and I roughly understand how it functions. However, say there is a corruption in one of the nodes in its sequence number for a particular route. ...
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2answers
35 views

How are packets ( received from the server ) sent to the host from the gateway ( which is present in the host network )?

If the host is receiving packets from a server, these packets have a destination IP address of the host and it is first received by the gateway present in the host network. Now the gateway checks the ...
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2answers
36 views

Fat-Tree topology

Fat tree network topology looks like a tree topology like below figure. In tree topology, we have same terminologies like Root, parent, child etc. This is mainly used to connect a large number of ...
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4answers
64k views

Why must all areas connect to an Area 0 backbone in OSPF?

This question is a literal repost of the same question asked on The Cisco Support Community. Answers are unique to Stack Exchange. Why is area 0 the backbone area in OSPF? Why must all other areas ...
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1answer
110 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
24 views

How can I assign a static public ip to a machine behind a router?

I know about port-forwarding, but I'm interested in how to make a machine on a local network available to the public internet without port-forwarding.
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0answers
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Routing Problem [closed]

I have an Ubiquiti Edgerouter X that is receiving the internet over PPPoe from a Modem. The router is configured to have network 192.168.1.0/24 and provide DHCP to devices. Plugged into one of the ...
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1answer
173 views

What is the effect of having too many bridges / routers between 2 devices?

I am building a network, with each node connected to each other using fiber media converters. They are actually a bridge with 2 ports: one Ethernet and one optical (or one single-mode and one multi-...
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1answer
50 views

Issue w/ Cisco router and failed NAT and static default route

I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...
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1answer
47 views

eBGP failover without packet drops

I have core1 and core2 router peer with same ISP but distinct hardware and they are sending us default route. currently all in/out traffic going over to core1 and core2 is idle (standby), I have iBGP ...
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27 views

Vlan Routing with ESXI and L3 Cisco Switch

Please, i need your help. I have read all the posts from the internet, but i don't know what is wrong. i want to ping from PC10 (portgroup in Vlan 10 with ip 1.1.10.200, GW 1.1.10.2) to the int vlan ...
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1answer
45 views

Correctly Setting up DHCP for Intervlan Routing

I am currently building a network and would like my two switches connected to my router to automatically assign ip addresses through DHCP pools to my PC's and devices. I have 4 separate VLans being ...
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0answers
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Determine the range of IP's avaliable for hosts on a subnet /28 [duplicate]

I am looking into my Virtual Switch configuration( Hyper-V ) and i am confused how the range of valid IP's is determined. The IP for configured for the "Virtual Switch" adapter is: IP: 192.168.53.65 ...
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2answers
205 views

transferring IPv4 /32 to another datacenter

We are planning to migrate one set of IPv4 /32 series owned by us, from one dedicated server provider to another provider. Is it necessary to have permission to release the IP series from previous ...
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2answers
2k views

Resolve overlapping subnet problem using Linux and IPTABLES! [closed]

I have a dilemma; I have a customer with an application server running on CentOS 5 (latest). The app server is configured with 2 interfaces: eth0 - connect to the client network with subnet 192.168....
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1answer
43 views

How can I use 1 static public IP address for multiple private networks in totally different physcical locations?

So, I know that DNS is important in the running of CDN services. DNS allows the routing client traffic to the physically nearest CDN server. Question is, how can I do the same thing without any DNS ...
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3answers
52k views

Does a traceroute/tracert show every hop, or does it skip/hide some details of the path?

I am currently in college for a bachelor's degree in Network Engineering, and one of my Professors explained in class that a traceroute that shows, for example, 15 hops is actually abstracting the ...
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2answers
28 views

After routers within an AS have their routing tables sorted, how router A make sure the packets from it take the most efficient route to router Z?

Question in the title. I know a bit about IGP. My understanding is that these protocols only ensure every router in an AS knows about other routers within the AS. So, the scenario, correct me if I'm ...
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0answers
14 views

Comparing ETX with PRR with retransmissions

Expected number of transmissions (ETX) and packet reception ratio (PRR) are two routing metrics that exist. Based on my understanding, the packet reception ratio reflects the link quality. If you ...
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3answers
2k views

How can multiple devices share an IP across the internet?

I do realize that most LANs sit behind a device running NAT, which translates the users private IP address to a public IP address. My question is still if you are trying to connect to a private device,...
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2answers
3k views

How does throttling of network traffic work (to limit bandwidth by ISP e.g.)?

I have tried to find the answer on how network throttling works e.g. by ISP when they limit your access to say 100 Mbps. As far as I know TCP/IP itself does not have any mechanisms for that, so it is ...
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3answers
2k views

Is it possible to specify a route for a packet to take?

So, AFAIK, packets "hop" between routers. Packets are forwarded via a router's default path until it gets to destination IP. So is it possible to specify a specific set of routers this packet "hops" ...
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2answers
928 views

How can a server from US connect to a tier 1 ISP?

According to this graph : here is a full size version The facebook AS32934 server in the US is direcly connected to DE-CIX in germany. How can that be possible ? Is there fibers over the ocean ?
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33 views

Routing daemon vs router configuration

Which is the difference between a routing daemon and a router configuration? For example using BIRD you can set up a BPG session, but you can always set up a BGP session for example using a CISCO ...
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0answers
22 views

Inter VLAN Routing - Dell S5212F with VLT

I would like to know how to best set up Inter VLAN routing on a Dell S5212F cluster. (Version 10.4.3) We have two S5212F Switchs which are connected via a VLT link. Now I would like to know how to ...
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2answers
621 views

Why can't I ping the next hop router on a directly connected network?

I have the following scenario: I am using two Cisco 1941 routers Network A connected to Router1 (192.168.10.0/24) (Gigabit connection) Network C connected to Router 2 (192.168.20.0/24) (Gigabit ...
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2answers
80 views

Routing in layer 3 switch vs old modem/router?

I believe what I am about to ask is on-topic. I have Cisco DPC3828S (wireless router/modem) from ISP, which I cannot turn into bridge. So, it does routing. I have layer 3 switch, Cisco SG350-10. ...
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2answers
232 views

Internet Scale Routing Table Size

In the link below, it is said that there are near one million prefixes for IPv4. https://bgp.he.net/report/netstats I want to know that it is a must for ISP routers to cache all these million IPv4 ...

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