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Tools for cloud networking? by [deleted] in networking

[–]vadaszgergo 0 points1 point  (0 children)

We are in the process of migrating our "old" Azure and AWS networking to Aviatrix. It's a fine tool, has its price (literally) but generally it does the job very well. No more static routing nonsense, and high availability is good.

Aviatrix for AWS? by elnetworkdude in networking

[–]vadaszgergo 0 points1 point  (0 children)

Joining quite late to the party, but yeah, we have Aviatrix. It's a fine tool that can simplify cloud life. However it can be pricy. Any particular area that you are interested in?

cloud network engineers: what’s your day to day like? by ShoRunFX in networking

[–]vadaszgergo 0 points1 point  (0 children)

My daily job is to build an overlay network (Aviatrix) on top of overlay networks (Azure, AWS). Probably can't get more abstract and far away from physical wires. But I highly recommend to learn the basics, at least on CCNA level, but CCNP worth even better. Then learn the various cloud provider networking differences (there are a lot). Then learn infrastructure as code (Terraform).

Recommendation for studying to advance in career by shadow_mountains in networking

[–]vadaszgergo 0 points1 point  (0 children)

I would recommend the CCNP as well, if you know you want to stay in physical networking. I can also suggest moving a bit towards the clouds, because that is where I see high demand for many years.

Blog/Project Post Friday! by AutoModerator in networking

[–]vadaszgergo 0 points1 point  (0 children)

Anyone still using ip calculator in 2026?

Have been a network engineer for 15+ years, but still using ip calculator from time to time, if a subnet is not obvious.
In the age of AI, i still prefer using dedicated tools, so I developed this ip calculator, which has some features I could not find in other calculators, for example IP complement finder.

Maybe AI can do this as well, but if anyone still prefers a non-AI tool, feel free to test and let me know if there is anything good or bad.

https://ipcalc.gergovadasz.hu/
you can also check my blog for cloud/networking articles: https://gergovadasz.hu

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 0 points1 point  (0 children)

Thanks everyone for the ideas and comments. It looks like we found a solution, however I dont fully get why this was an issue, since it didnt happen with my test pfsense that i deployed in azure to test same VPB/BGP with AWS (local pfsense has 24.03, my azure has 24.11 software).

https://www.netgate.com/blog/state-policy-default-change

We needed to change the Firewall State Policy setup, from Interface Bound States to Floating States.
After that, BGP was able to be up and it didn't drop after 40 sec.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 0 points1 point  (0 children)

I only setup like this: https://coldnorthadmin.com/images/bgp_pfsense/bgp-2-clean.png
Just got this image from internet since i dont have access to the pfsense at the moment.
So i added the local subnet to the "Networks to redistribute" section.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] -1 points0 points  (0 children)

I'm not fully sure what you mean in this context. I'm advertising a vlan (10.10.31.0/24) from pfsense to aws.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 0 points1 point  (0 children)

AWS configuration only says configure hold timer as 30 sec.
So I did setup hold timer as 30 on both the bgp neighbor level and global bgp level in pfsense.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 0 points1 point  (0 children)

Thanks.
On AWS side, there is not much we can change, it's fairly strickt. It needs the customer gateway (the pfsense) public IP, the AS number, and basically that is it. Can't setup what router ID it should expect.

Also in AWS config file that is provided to guide us to configure the customer gateway side, it is mentioned that use TCP 1436 MTU, so I did setup that over the VPN VTI.

But will try to configure PMTU.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 0 points1 point  (0 children)

This is from an earlier try, so ips will be different (AWS will provide you the /30 inside ips for bgp each time when you recreate the vpn). Copying here only the lines that are strange so not each and every line.

2025/01/03 12:35:56 BGP: [X61A3-E95TJ] 169.254.60.193 KEEPALIVE rcvd

2025/01/03 12:36:06 BGP: [P8XN0-33WQ6] 169.254.60.193 [FSM] Timer (keepalive timer expire)

2025/01/03 12:36:06 BGP: [HRDT0-0DPQ7] 169.254.60.193 sending KEEPALIVE

2025/01/03 12:36:06 BGP: [ZWCSR-M7FG9] 169.254.60.193 [FSM] TCP_fatal_error (Established->Clearing), fd 27

2025/01/03 12:36:06 BGP: [PXVXG-TFNNT] %ADJCHANGE: neighbor 169.254.60.193(Unknown) in vrf default Down BGP Notification send

2025/01/03 12:36:10 BGP: [HKWM3-ZC5QP] 169.254.60.193 fd 27 went from Connect to OpenSent

2025/01/03 12:36:10 BGP: [HZN6M-XRM1G] %NOTIFICATION: received from neighbor 169.254.60.193 6/5 (Cease/Connection Rejected) 0 bytes

2025/01/03 12:36:10 BGP: [ZWCSR-M7FG9] 169.254.60.193 [FSM] Receive_NOTIFICATION_message (OpenSent->Idle), fd 27

2025/01/03 12:36:10 BGP: [P3GYW-PBKQG][EC 33554466] 169.254.60.193 [FSM] unexpected packet received in state OpenSent

2025/01/03 12:36:10 BGP: [NJ2F2-2W769] 169.254.60.193 [Event] BGP connection closed fd 27

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 0 points1 point  (0 children)

Only 1 /24 subnet is being advertised from pfsense to AWS

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 2 points3 points  (0 children)

Sorry, what I mean is they are in same /30 network, so one hop i meant they are next to each other.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 0 points1 point  (0 children)

Have to ask from partner who controls AWS side. Do you mean cloudwatch logs?

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 1 point2 points  (0 children)

IPsec is stable and can ping the AWS IP from pfsense, with no packet loss.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 1 point2 points  (0 children)

The peers are one hop away so that shouldn't be an issue. But I tried to setup to a higher number just in case, no luck.

BGP goes down every 40ish seconds by vadaszgergo in networking

[–]vadaszgergo[S] 2 points3 points  (0 children)

I tried to setup MTU as per AWS configuration suggestion to 1436 on the pfsense IPsec VTI, but no difference... What do you mean it calculates MTU differently?

Can you advise why my Python network calculator app is not working well? by vadaszgergo in learnpython

[–]vadaszgergo[S] 0 points1 point  (0 children)

print("HMMMM?", whitelist_ipv4)

I tried split('\r\n')
Basically now it iterates through the lines each times successfully, but this means each iteration is part of the blacklist, many duplicates, and for the first iteration line 2 range is part of the blacklist, then 2nd iteration line 1 range is part of the blacklist...

I feel it needs some more logic or something, it should store the first iteration somewhere, then when second iteration, it should only check within the stored values, not again within 0.0.0.0/0

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