Questions tagged [asymmetric-routing]

For questions about Asymmetric Routing, where a packet traverses from a source to a destination in one path and takes a different path when it returns to the source. This is commonly seen in Layer-3 routed networks. For instance, you are troubleshooting a case, where Asymmetric routing does not work.

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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
0 votes
2 answers
168 views

Server with multiple NICs takes different route when answering

I have multiple servers which share 2 networks. That is the LAN Network at 192.168.1.0/24, aswell as the Backbone Network at 192.168.5.0/24. ┌────────────────┐ ...
Gandalf1783's user avatar
3 votes
1 answer
355 views

Juniper SRX 340 route lookup failed

I've a strange issue on my Juniper; I've a policy to allow all traffic to a specific address behind it and, in effect, the policy works correctly. All the traffic I send reach the destination, except ...
Gianluca's user avatar
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3 votes
3 answers
614 views

Multihoming with two 'good' providers - load sharing strategy?

We get two 100G links, one from each provider and our aggregate traffic is sub 100G. The rationale is one provider can fail and the other will pick up the slack with zero degradation. Our traffic ...
NOCNinja323's user avatar
2 votes
3 answers
1k views

How can you determine the result of a load-balancing hashing algorithm (such as ECMP/LAG) for troubleshooting?

In many architectures there are load-balancing mechanisms such as ECMP routing or LAG between various interfaces. This load-balancing is usually per-flow, based on a hash of various criteria, such as ...
Duke Rusty's user avatar
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1 answer
49 views

What are the current security issues S-BGP has?

The question is explained in full in the title. I wish to know what the security issues are when deploying S-BGP. Thank you in advance!
IliasWhoElse's user avatar
1 vote
1 answer
228 views

How do I achieve different routing path for same destination in cisco router

I want to route same destination packet coming from the different source s1 and S2, to different path something like this ip route 192.168.221.0 255.255.255.0 192.168.222.1 ip route 192.168.221.0 ...
Amar's user avatar
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3 votes
1 answer
1k views

Asymmetric routing issue

Please find the network diagram, We have MPLS and Internet connectivity in our some of spoke sites in Hub router running in IPSLA for failure purpose. Here MPLS is the primary and VPN is the ...
Karthick Whitey's user avatar
1 vote
1 answer
299 views

Juniper SRX650: redundantly connected locations and asymmetric routing

I currently have a total of 4 locations with clustered SRX650's. Each location also has redundant internet connections. We'll call the locations Office1, Office2, DC1, DC2. Currently the offices are ...
Greg Walters's user avatar
3 votes
1 answer
3k views

Multi-homing and BGP routing with less than /24

Background: We own /24 as well as /23 blocks provider independent. I am talking to an ISP, say ISP-A for a 10G line with a IPVPN line (2 links - actual inbound + IPVPN link for clean traffic when ...
user88975's user avatar
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3 votes
3 answers
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Why do these static routes need to be bi-directional?

I am setting up a testbed for some VMs. These routes need to be static as this is an academic project. (I know that doing this manually is generally a bad idea. Trust me, I have a reason for this.) I'...
Maxthecat's user avatar
  • 145
0 votes
1 answer
540 views

Is there any tool or API to infer AS-path between any 2 arbitrary Autonomous System?

Dear all experts out there, Is there any tool or API to infer AS-path between any 2 arbitrary Autonomous System?
wgq23ggee's user avatar
  • 211
3 votes
3 answers
477 views

What are the advantages of having a router instead of a firewall in this case?

I have watched a video explaining assymetric routing today. In this video, two solutions to AR (among others) are shown: First solution: Second solution: What are the advantages of the second ...
syntagma's user avatar
  • 349
1 vote
1 answer
58 views

Will shorter route be less asymmetric than longer route?

As you may know that due to the dynamic in Internet Infrastructure, the request packet and return packet are not guaranteed to be sent and came back on the same route, which is called asymmetric ...
wgq23ggee's user avatar
  • 211
10 votes
2 answers
13k views

why STUN doesn't work with symmetric NAT?

I read this line from wikipedia. "STUN does work with three types of NAT: full cone NAT, restricted cone NAT, and port restricted cone NAT. In the cases of restricted cone or port restricted ...
Kristen's user avatar
  • 235
6 votes
1 answer
840 views

BGP, multipathing, and possibly OSPF

I'm setting up a second site for redundancy and DR. The goals are as follows: ISP fault-tolerance from either site: HostA, for example, can reach the internet in the event that ISP-A(primary) and ...
mwood's user avatar
  • 395
6 votes
2 answers
3k views

VRFs to address asymmetric routing with stateful inspection

For branch offices with dual routers and WAN connections asymmetric routing causes issues with stateful packet inspection. Packets leaving through one router and returning through the other are ...
Stephen Craven's user avatar
3 votes
3 answers
654 views

How do apps know about asymmetric routing?

We made did a campus LAN upgrade recently, during which we migrated from a mixed EIGRP/OSPF IGP to a multi-area OSPF redistributing to/from BGP on our WAN. We have two entry points on different sides ...
Pseudocyber's user avatar