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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Why can multiple ASNs have ROAs for the same prefix in RPKI?

I am trying to understand RPKI better and I am looking at some raw data dumps. My initial understanding of RPKI was that it would help identify and authenticate "the one" ASN that is ...
2 votes
1 answer
57 views

OSPF routes are not advertised

routers with ASBR2 connecting to AREA 0 and 10 and ASBR1 connecting to area 0 and 20, there's no entry of routes in R1's routing table, help me out R1#sh run Building configuration... Current ...
2 votes
1 answer
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RIP routes are not being advertised

I have 2 routers(R3 and R4 connected with serial links). I have advertised my loopbacks with RIP ver 2. with 192.168.1.1/32 and 192.168.2.1/32 on R3 and 192.168.3.1/32 and 192.168.4.1/32 on R4. My ...
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Perform port forward on 169.254.0.1 device [closed]

I have teltonika router on a mobile connection Lets say the ip is 10.132.141.25 On the lan of the router I have a device that is default setup to have the ip IP = 169.254.0.1 Mask = 255.255.0.0 ...
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Fiber Ring Routing across L2/L3 HP switches [closed]

Having some issues for routing traffic from a 5406zl procurve switch through 5 tagged 2930f procurve switches and a 8212zl switch. I want to route all traffic to my firewall which currently is ...
0 votes
2 answers
431 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/...
2 votes
3 answers
351 views

When would we use more than 1 dynamic routing protocol?

I am learning about different dynamic routing protocols and I've learned that each dynamic routing protocol has an AD assigned to it which indicates the trustworthiness of the learned route from that ...
1 vote
2 answers
135 views

Colocation Rack Networking

I'm a sysadmin tasked with finding a managed service provider or networking contractor to build out our new colo space networking. I'm hoping to get some input to make sure I don't sound like an idiot ...
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OSPF - How does slave know what to send LSR to when DBD is not shared by the master

Consider a topology where R1 and R2 are connected. R1 has following networks. 192.168.1.0/24 192.168.2.0/24 192.168.100.1/32 R2 has following networks. 192.168.2.0/24 192.168.30.0/24 192.168.2.1 and ...
1 vote
4 answers
133 views

Can a router provide DHCP to multiple subnets that are connected via switches?

I'm trying to understand if it is possible to have a router (as shown in the below diagram) provide DHCP leases to more than one subnet if the subnets are not directly attached. If both the printers ...
1 vote
1 answer
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Basic question on 'network history based routing tables'

I have encountered the following sequence of words: 'routing table formed on the basis of network history information'. I know that initially, routers discover neighbor nodes and therby the possible ...
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1 answer
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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 ...
0 votes
1 answer
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In gnss3, why can't I ping my cisco router from my VM?

I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router: configure terminal ...
3 votes
3 answers
468 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 ...
1 vote
3 answers
97 views

How do we discover hosts on another subnet without knowing their IP or MAC address

If I have a client who wishes to send a UDP packet to another client, how would I scan for his IP address if Client 2 is located in another subnet? If I'm trying to discover clients on my own subnet I ...
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Understanding mtr output [duplicate]

Here is my mtr output to googe.com. mehost (me_IP) -> google.com (142.251.40.142) 2022-06-09T09:55:16-0400 Keys: Help Display mode Restart ...
2 votes
2 answers
82 views

Why iBGP speaker should not modify next hop address?

I understand the concept of "Split Horizon" that an iBGP router A learns an external route from an iBGP router B, thereafter, iBGP router B will not advertise the same route to other iBGP ...
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1 answer
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Routing VLANs to Firewall Ports

My network has 3 VLANs: 10, 11, 12, and their address spaces are 10.0.X.0/24 where X is the VLAN ID. Their default gateway is a virtualized pfSense (even though it's virtual, I will use terminology as ...
2 votes
0 answers
373 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 ...
0 votes
1 answer
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VLAN and firewall interconnection

I'm encountering some difficulties to connect some VLANs to a physical firewall. In details I have a core network with a L3 switch as a router and some L2 switches as access network. The network is ...
1 vote
1 answer
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IPv6 subnets without delegated prefix

I have received an IPv6 network from my provider, say it's 2001:db8:1::/48. I did not get delegated prefix from them. I would like to use the IPv6 addresses on different networks behind a firewall (...
2 votes
1 answer
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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 ...
6 votes
1 answer
200 views

What's the domain of an IP?

CIDR stands for "Classless Inter-Domain Routing". But what's a domain in this case? Seems to not be the same kind of domain as DNS deals with...
3 votes
1 answer
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Setting an OSPF router in one area that doesn't see other areas

Could an OSPF router be configured so that it can only see its own area LSAs and does not accept LSAs from other areas? (For example, if it is in area 2, its routing table just shows routes in area 2, ...
2 votes
4 answers
702 views

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 ...
2 votes
3 answers
749 views

static route distance value fail over

Config: ip route 172.27.8.17/32 172.24.0.141 ip route 172.27.8.17/32 172.24.0.102 2 Result: show ip route 172.27.8.17 Routing entry for 172.27.8.17/32 Known via "static", distance 2, metric 0 ...
1 vote
0 answers
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Routing correctly mesh + gatewaty [closed]

I have a router modem DSL I have 2 Aimesh Asus AX XT8 For a reason the node can not talk with the router base over WIFI (long range). I than connected the lan on the modem(DSL ROUTER) to the NODE - ...
0 votes
2 answers
82 views

How to configure a layer-3 switch for routing between VLANs?

I have set up the router as a dhcp server and I would like to use the layer 3 switch to route each PC in seperate vlans. How do I configure the router and L3 switch for inter vlan routing ? the router ...
0 votes
0 answers
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Connecting 9 Remote Sites with VPN Tunnels

I am working in a Cisco ecosystem and need to be able to test a 9 tunnel IPSec network over the internet using 10 x Cisco 1941 routers. This is a "hub and spoke" type configuration; where ...
0 votes
0 answers
44 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 ...
24 votes
7 answers
9k views

Does CIDR really "do away" with IP address classes?

I am still struggling to understand to what extent CIDR really renders IP address classes obsolete. Here's what I understood so far: It's ridiculously inefficient (and impossible, too) to assign ...
0 votes
1 answer
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What are the IP/MAC addresses of requests between 2 different subnets? [closed]

Assume that networks 172.15.10.0/24 and 172.15.11.0/24 are connected through a router with interfaces 172.15.10.254 (MAC3) and 172.15.11.253 (MAC4). If host A sends a packet through its network ...
0 votes
1 answer
208 views

Unknown cause of disappearing CAM table entry and unicast flooding

Posting this in response to the closed question: Network flooding without ff-ff-ff-ff-ff-ff (layer 2 broadcast) MAC address in destination? I have a network that is experiencing the following problem: ...
1 vote
1 answer
3k views

pfSense join 2 networks

I've got 2 pfsense boxes taking care of separate networks, with separate gateways. We've managed to drop a cable between the 2 networks so would now like to join the 2 networks so machines on each ...
0 votes
3 answers
343 views

Site-to-site IPSec tunnel over Load balancer

I'm having a following topology Could this be achieved? I've configured this network, but routing between the two VLAN-s are not working. Using Ubiquity Edge X routers. Could this be archived with ...
1 vote
1 answer
197 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
124 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 ...
7 votes
3 answers
668 views

Can I announce the same block of /24 given to me by ARIN at two different locations?

The setting: Two locations I'm trying to connect. I have a /24 address block from ARIN Both location have the Same ISP. The Question: Can I announce the same /24 address block at the HQ location to ...
0 votes
0 answers
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Cisco EFP point-to-point -- How to see MAC addresses

I see on cisco ME3600x and I read in documentation as below, that "the MAC learning is not supported in point–to–point bridge domains" Table 1 MAC Learning Actions Scenario Action A bridge ...
0 votes
1 answer
178 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 ...
0 votes
1 answer
106 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 ...
0 votes
1 answer
33 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
69 views

VLAN routing on the same subnet

Consider following situation: You have 10.3.0.0/16 network without any VLANs. Now You want to divide it... You want Your IT department be able to reach the entire network, but sales department only ...
0 votes
2 answers
45 views

How does a host (HOST_A) on LAN1 send a packet to a a network more than 1 hop away and how does a router (ROUTERX) handle that packet?

Suppose there is a host, HOST_A, on LAN1 and is sending a packet. The destination address of that packet is: 10.10.11.77 HOST_A will refer to it's routing table and see that that there is no entry for ...
1 vote
1 answer
94 views

Ospf multicasting with two different group

Suppose I have one ospf network where two multicast group exists. And some routers is ospf which belongs to one group or multiple group (Like: routers E, H) and router is layer3 router (Like: ...
3 votes
2 answers
171 views

Time taken to complete a routing table update and possible interruption

I am wondering if a routing/forwarding table update at a switching node (e.x., a switch or layer-3 router) can cause momentary packet drop or increased delay for a data stream that will traverse this ...
0 votes
1 answer
411 views

EdgeRouter X select one out of two WANs according to target IP range

I am using IPSET to define the interested IP range. I want to direct packets to one out of two WAN connections according to an IP range. Here are my conditions. A specific IP range. It is defined by ...
8 votes
4 answers
2k views

BGP - how does IGP know the right route?

Let's consider a host A in an autonomous system AS100. Suppose it wants to communicate with host B in another AS, say, AS200. In AS100 there are several routers. Within one AS, the rotuing protocols ...
2 votes
3 answers
67 views

CCNA | OSPF | What differences can exist between two processes of a single routing protocol?

It is my understanding that a process is a specific-instance of a routing protocol. The process-id is a symbolic representation of a unique instance of that RP within a router. If that's the case, ...
4 votes
1 answer
80 views

How Can a VPC ping the Router through an Etherswitch that behaves in one port as router and in the other as switch

In the following topology my main purpose is to: 1)PC11 ping Router(R) 2)PC11 ping PC13 ESW10: In gig0/3 has the no switchport command and a given IP address. In gig0/2 it has the switchport access ...

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