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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Connecting L3 and L2 switches with VLAN settings

I have 1 L3 switch with Static ip - 192.168.0.252 Two L2 switches Switch A - 192.168.0.250 Switch B - 192.168.0.251 I have created VLANs in L3 switches with 192.168.1.1 and 192.168.2.2 ips abd set it ...
0 votes
0 answers
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Trying to reach an ip address through a gateway on windows [closed]

I have a device 192.168.3.90, I set the gateway to 192.168.3.193. 192.168.3.193 is a windows machine with a shared connection. That shared connection works for any website or ip accessible from that ...
0 votes
1 answer
54 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 ...
1 vote
2 answers
297 views

bgp and routing

I need a bit of help understanding what is going on in my topology. I really want to understand why i can ping 1.1.1.1 from r4 but not from r5 or r6. Please help and advise me. Many thanks guys r1 ...
0 votes
0 answers
17 views

How to route all Windows Traffic to WSL2? [closed]

I want to route all traffic from Windows to WSL2 (172.28.20.4), but I have little knowledge about networking. I did try to add a route: route add 0.0.0.0 mask 0.0.0.0 172.28.20.4 I also enabled IP ...
0 votes
1 answer
25 views

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 ...
0 votes
0 answers
11 views

Outgoing connection from NAS via reverse proxy [closed]

I have a couple of NAS at home that sit behind a reverse proxy. The reverse proxy server is the one that is exposed to the internet and has both ports 80 and 443 available via firewall. Both NAS are ...
0 votes
1 answer
38 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, ...
0 votes
3 answers
3k views

Cannot create subinterface

I'm trying to connect 4 networks with 1 router, i created 2 sub-interfaces in the router, when i tried to create the 3rd sub-interface i got this output "%Cannot create sub-interface", this ...
1 vote
1 answer
64 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 ...
1 vote
1 answer
83 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->...
2 votes
1 answer
123 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 ...
2 votes
2 answers
58 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 ...
6 votes
1 answer
23k views

How to aggregate a routing table given IP addresses and their subnet masks

Novice networker here. I can't seem to find any straightforward answers online. Example: IP SUBNET NEXT HOP > 129.10.112.0 255.255.255.0 R1 > 129.10.80.0 255....
2 votes
2 answers
5k views

Managing multiple internet connections to a single switch

We have 2 internet connections coming in to our building - neither are great (2 different routers from different providers). Are there technologies in Network Switches to support active switching or ...
0 votes
1 answer
1k 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 ...
0 votes
1 answer
64 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 ...
10 votes
6 answers
3k 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?
6 votes
2 answers
17k views

Local pref VS prepend AS-path for two eBGP router

I have two routers, AS50 and AS100, both are under my control. Since they are using different ASN, they should be eBGP routers. These two routers are connected by internet VPN and lease line, which ...
1 vote
0 answers
876 views

BGP transitive attributes for single ASN multiple prefixes multiple neighbors

I believe I'm on the right track, but have stumble across something with advertising BGP prefixes to neighbors. I am wonder how if I have a single ASN with multiple prefixes (99.1.1.0/24 and 111.1.1.0/...
1 vote
1 answer
50 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 ...
2 votes
1 answer
2k 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 ...
2 votes
0 answers
354 views

ip routing preference problem

On my Huawei CE12800 device, I am trying to run this config. Beside a standart BGP process, I am using three community values to control traffic with my upstream provider. With 555 community value, I ...
6 votes
2 answers
2k views

Must the checksum field of the IPv4 header always be updated?

When an IPv4 datagram comes to a router for forwarding, does it always update the value of the header checksum field?
1 vote
0 answers
169 views

Is there a way to check which routes are matched by a term in a routing map?

I have created a prefix-list and I am using it in a route-map. However, my route-map is not working as I expect it to work. ip prefix-list LIST_A seq 5 permit 10.20.20.0/22 ge 32 route-map A-B-OUT ...
1 vote
3 answers
190 views

How does a new switch know how to reach the controller in an SDN?

Let's say we have an existing SDN network composed of several switches and a controller. Now say we connected a new switch to the network. Now how would the new switch know how to reach the controller?...
2 votes
0 answers
795 views

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 ...
3 votes
1 answer
104 views

Should I be using point-to-point or broadcast if I plan on using SVIs in IS-IS on Juniper?

Apologies in advance if this is super-basic question, still learning ISIS. I'm migrating from Cisco over to Juniper in an environment where all of the switches are running EIGRP, are on a 172.31.255.0/...
2 votes
1 answer
284 views

DHCP relay question in small network

Baby network person here. I'm trying to set up a small network such as the one in attached picture. 3 routers, 3 switches, 3 endpoints. Color boxes denote subnets. If I want to have only 1 DHCP ...
1 vote
4 answers
4k 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, ...
1 vote
1 answer
64 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 ...
0 votes
2 answers
49 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 ...
0 votes
1 answer
58 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 ...
0 votes
1 answer
89 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 ...
1 vote
1 answer
266 views

Explaining the entries in routing table

I would like to ask for help with explaining every particular entry in routing table. That is what I receive after calling route print in my PC, based on Windows: So my understanding is: 0.0.0.0 ...
0 votes
1 answer
50 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 ...
0 votes
1 answer
83 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 ...
1 vote
1 answer
462 views

How to block telnet access for one particular network from all networks except one using Extended ACL

Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
2 votes
1 answer
383 views

Cisco IOS XE DHCP Starlink - Static route issue

Today i connected the Starlink dish to an Cisco ISO-XE Box (ISR1111) as a secondary wan link and noticed some strange behavior. I installed a static host-Route to an VPN Tunnel endpoint via ip route x....
2 votes
1 answer
470 views

Why I can't ping my switch Vlan99?

In the following network, I have configured every device but somehow I can't ping my Customer-PC and Technical-PC to PasirGudang-SW and Segamat-SW. The PCs can ping the other ip address just fine ...
0 votes
2 answers
1k views

Routing between SVI and routed port on router

How can I achieve reachability from vlan terminated on the L3 switch to routed port on the router, FW? F.E int vlan 10,50 are the SVI's on L3 switch vlan 10 - 10.0.10.254 /24 vlan 50 - 10.0.50.254 /24 ...
3 votes
1 answer
188 views

Juniper EX4200 Public Subnet Vlan Routing

We have a Juniper EX4200 which is connected via ge-0/0/0 trunk port to the providers router. We got our own vlan(id 250) and there are two public subnets routed on this vlan. Currently all our serves ...
1 vote
2 answers
161 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 ...
0 votes
1 answer
244 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 ...
1 vote
1 answer
164 views

Configure AAA on a router - Extended ACLs

How do I write a named extended ACL which will allow for traffic between a DNS from a LAN (IP address) to a DNS server at (IP address), ping from a host PC (IP address) to any destination and allow ...
1 vote
1 answer
282 views

Multiple GRE tunnels towards single host using anycast IP

I'm trying to build the following network architecture: Where clients try to connect to a backend server (e.g. SSH) by using a Public Anycast IP adddress (1.2.3.4), that routes the client to the ...
1 vote
1 answer
86 views

Can an application on two separate devices share a packet to similar resource?

Can packets requested for an image by an app on a phone be sent to same app on another phone by another user?
0 votes
1 answer
36 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 ...
3 votes
1 answer
315 views

Cisco ISR Zone Based Firewall dual stack not matching returning traffic for ipv6

I have a bit of a problem with my Cisco 1921 ISR config. I have ipv4 (obviously) and also native ipv6 connectivity in my home lab. I am trying to set up the zone based firewall. With ipv4 traffic, the ...
0 votes
1 answer
59 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 ...

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