Show threadDrScriptt1d ago

It seems like there might not be a Cisco IOS solution for adding latency to connections.

I can’t say as I’m surprised. After all, QoS is about adjusting priority and reordering use of existing resources.

That being said, I think that I can likely punt out to Linux and add some artificial latency with the `tc` command.

🤔😈

#TNCLabNet

DrScriptt1d ago

One of the design ideas behind the three sections of #TNCLabNet is that the three headquarters are spread around the globe in follow the sun ☀️ and / or moon 🌙 support, ideally in time zones that are eight hours apart.

@gumnos brings up a good point. I should try to incorporate (artificial) latency to emulate things on separate continents.

I bet there is something in QoS on Linux that could do this.

I wonder if there is anything in IOS that can induce similar latency.

🤔

https://mastodon.bsd.cafe/@gumnos/116804952558158614

Tim Chase (@[email protected])

@[email protected] introducing artificial latency between your continents? 😆

BSD.cafe Mastodon Portal
DrScriptt1d ago

#TNCLabNet - 2026-06-23

• I built out the 3rd continent today, consisting of another 15 routers.

• I set up the first “”production Cloud UDP tunnel connection from #GNS3 to #uBridge and a TAP interface connected to the Linux bridge that #Proxmox uses. — Now I have native IP in-band connectivity into TNCLabNet.

• I added #IPv6 to all 50+ virtual 7206VXRs.

• I updated the dynamic routing to support IPv6.

• I wrestled with Cisco iOS to learn that I need to explicitly enable IPv6 routing (forwarding) instead of just being a client device.

• I did a proof of concept for SSH access to the routers.

• I used said SSH access to collect some sample data to gather interfaces and IPs so that incan build DNS entries for things.

Show threadDrScriptt2d ago

@CursedSilicon here’s a link to the thread about #TNCLabNet that I tagged you and @snep in because of #cghmn.

You might find the project interesting and somewhat familiar.

https://oldbytes.space/@drscriptt/116797661269257035

DrScriptt (@[email protected])

I’ve started a new project: #TNCLabNet Some people build model cars. Some people build model plains. Some people build model ships … in bottles. Some people build model trains … with dioramas that fill rooms. I build … model networks. TNC Lab Network, or ‘LabNet’, is becoming a real thing. LabNet is currently specced as: 3 × (international) Headquarters 3 × Regional Offices per HQ 3 × Branch Offices per RO With a star WAN topology that follows suit. There will also be: 1 × National ISP per HQ 2 × Regional ISPs per HQ 2 × Local ISPs per RISP The three NISPs will come together at one network access point (NAP) / internet exchange point (IXP) which I’m calling NAP/IX’ So there will be the enterprise network, and multiple ISP networks all with their own routers, firewalls, and the likes. Each office will have multiple servers. Each higher level will be more complex. Regional has email and database servers. Headquarters will have HA clusters therefor. I plan on incorporating some BIGiron. My P/390-E and iSeries will get a workout. Yes, that means I’ll be connecting the virtual with the physical. I want to try to run as many protocols as possible inside the enterprise network. The short list is: • TCP/IP • IPX/SPX • AppleTalk (DDP) • DECnet • NetBIOS / SNA If I can, I’d like to incorporate Banyan Vines and Artisoft LANtastic. Because why not‽ I’ll tag these posts so you can easily filter them. Evil bit anyone?

OldBytes Space - Mastodon
Show threadDrScriptt2d ago

I suspect that #cghmn will be making an appearance in #TNCLabNet.

I bet @snep and / or @CursedSilicon have understandably given up on me.

Show threadDrScriptt2d ago

Yes #TNCLabNet is what prompted the question about graphics / CAD programs.

https://oldbytes.space/@drscriptt/116769619090100637

DrScriptt (@[email protected])

I’m not sure what ${THING} to use to create a picture / diagram / graphic of a project that I’m working on. I want to be able to place some (geometric) shapes (circles, squares, triangles, etc) around a central point at specific angles; 120°, 40°, and 12°. I’d also like some lines that interconnect some shapes (with strait lines). It’s sort of a radial / aerial diagram of interconnections. I feel like traditional graphics programs are just going to frustrate me. I feel like traditional CAD programs are going to be too strict. Does anyone have a recommendation for a graphics program / package / app recommendation?

OldBytes Space - Mastodon
Show threadDrScriptt2d ago

I’m enjoying the hell out of my #TNCLabNet project.

I’ve already used the incomplete build to test trace routes while playing with taking links out of service to see what happens.

I’ve already learned how to configure (OSI) Intermediate System to Intermediate System* to make this work. Including authentication. 😈

TL;DR: one giant Level 2 as recommended by multiple NANOG presentations / slide decks.

I may eventually add a Level 1 for #edutainment.

There will also be BGP, both external and internal.

* not typing the acronym for ${REASONS}.

Show threadDrScriptt2d ago

Speaking of Linux, I guess I should share that I’m hosting #TNCLabNet on Proxmox and that #GNS3 is running in a Debian 13 container, so it effectively gets native performance.

The hardware is an old IBM / Lenovo x3650 with 2 × 12-core CPUs and 128 GB of memory.

So far, all the emulated 7206VXRs are not even using 2 cores and less than 3 GB of RAM.

I will be using Cloud nodes (UDP tunnels) connected to uBridge running on Proxmox with TAP devices added to the Linux native bridges that Proxmox uses.

So things running in GNS3 will the the actual routers used by the VMs running in Proxmox.

😈

Show threadDrScriptt2d ago

I’ve already run into an issue which was causing #GNS3 to misbehave, flood my home network, and ultimately crash or be killed by the Linux kernel whichever came first.

So I had to hand edit my #TNCLabNet.gns3 to fix a oopse.

ProTip: Do not have multiple “Cloud” nodes connected to the same L2 switch fabric.

It turns out that they have a connection to eth0 by default.

So when I had between three and five connected to multiple interconnected switches, well I had a massive L2 loop that was causing things to get EXCEEDINGLY unhappy.

Show threadDrScriptt2d ago

I currently have 37 Cisco 7206VXRs configured in #GNS3 for #TNCLabNet.

That is just the corporate router infrastructure for all three headquarters as well as two sets of three regional offices and nine branch offices plus a test router (think workstation but it’s a router when working in GNS3).

The headquarters are linked in a full mesh of 2 × DS-5 (OC-3 155 at Mbps) Packet over Sonet (POS) full mesh.

Regional offices each have 2 × DS-3 (at 45 Mbps) ATM links to local HQ.

Branch offices each have 1 × DS-1 (T1 at 1.5 Mbps) Frame Relay links to local regional office.

Internal IP addressing is predictable; based on headquarters, region, and branch.

I currently only have IPv4. But have no fear, IPv6 is on its way to save the ${DAY}.

I’m using 10. for the enterprise, naturally.

I’ll be using 169.254/16 for the NAP/IX’ peering LAN, because ${REASONS}.

I still pondering what to use on the ISP networks. — I have a friend that has a pair of unused / unrouted /24s that I may borrow and abuse inside LabNet.

😈