This document discusses ways to improve network experiences for users. It examines load levels on different network equipment and suggests reductions that could lower latency such as turning off ADSL interleaving and WiFi acknowledgements. It notes that humans can tolerate delays of up to 10 seconds and compares download speeds to streaming video. The conclusion emphasizes keeping users' experiences and expectations in mind to benefit both operations and users.

1. AusNOG 2019
A bit of UX for NEs
Mark Smith
markzzzsmith@gmail.com
@ipv6tao
@markzzzsmith

2. BRAS (production)
Cisco 7301
~5000 sessions
~90% load
LNS (testing)
Cisco 7301
~1 or 2 sessions
~<1% load
PPPoE L2TPv2

4. 100ms Snappiness?
Internet
SW DMZ
SW Pubblico
Firewall + VPN gateway
SW LAN
Router VDF
Balancer
Karix
MOXA
MNO 1
MNO 2
Morfeo
Cliente 1
Cliente 2
DB quotidiano
DB storico
DNS
Internet
SW DMZ
SW Pubblico
Firewall + VPN gateway
SW LAN
Router VDF
Balancer
Karix
MOXA
MNO 1
MNO 2
Morfeo
Cliente 1
Cliente 2
DB quotidiano
DB storico

5. Reductions?
Lower latency link
e.g.
ADSL Interleave off,
Wifi Acknowledgements
off.
DNS Caching Resolver
Closer to User
e.g.
In the POP/POI
CDN Closer to User
e.g.
In the POP/POI
Faster Data TCP
TCP Fast Open

6. Old Core Switch New Core Switch
3 – 5 seconds
target max
Temporarily
switched off:
● STP
● PaGP

8. Humans tolerate
silent delays
of up to 10
seconds.

9. https://www.nngroup.com/articles/response-times-3-important-limits/

10. “Fast” Uploads/Downloads?
“Fast” <= 10 seconds

11. Fast DVD download?
4.7GB/10 seconds = 4 Gbps
Fast 4K Ultra HD Blu-Ray download?
66GB/10 seconds = 56.7 Gbps

12. SVOD > D(ownload)VOD
Clearly!

14. -
+

15. Minor Packet Loss
Excessive Latency/Lag
Occasional service dropouts

16. Minor Packet Loss
Excessive Latency/Lag
Occasional service dropouts

17. Keep users’
experiences and
expectations in
mind.
Use them to your
operational
advantage, and for
your users benefit.