I'm looking for a problem for my solution.
Who has experienced causal inconsistencies with stateful serverless functions?
For instance:
Initially, x=y=0 and are shared objects that functions A, B and C can read and update.
Function A updates x to value 2 and is chained to function B.
Function B on reception of function A's event, updates y to value 1 and is chained to function C.
Function C, on reception of function B's event and because of asynchrony and network delay, receives update to y late. Function C computes z=x/y (2/0) and crashes.

#stateful #serverless #cloud #aws #orleans #akka #azure

#VMware #Security #VirtualCloudNetwork #RunNSX #GFW - #NSX 4.0.1 #Stateful Active-Active #Gateway – Part 2 – Two Tier Routing (by Harikrishnan T) VMware NSX #vExpertNSX #vExpert

https://advocacy.vmware.com/member/post/nsx-4-0-1-stateful-active-active-gateway-part-2-two-tier-routing/ced716c5-636d-4ec3-936f-efff8c91d305

Firewalls can be divided into:
1. Stateful
1.1 Packet Filtering Firewall

2. Stateless
2.1 Packet Filtering Firewall/Routers
2.2 Circuit-level gateway Firewall/Proxy Servers
2.3 Application-level gateway

3. Next Generation Firewall

Depending on how vendors deliver their #firewall, firewalls can be of 3 types:

1. Hardware FW
Runs on #network hardware

2. Software FW
Runs on #host computers

3. Cloud FW
Provides Firewall-as-a-Service (FaaS)

Brief Details:

1. Stateful
Uses Stateful inspection #technology, inspects inside packets, examines+catalogs patterns of its behavior, remembers this behaviour for future, so needs more memory

1.1 Stateful Packet filtering FW
Often a software Packet #filtering firewall acts like #stateful.
🛡️ #Protocol that implement this FW: TCP
🛡️ List of stateful FW:
🔸#windows Defender Firewall (#software)
🔸Palo Alto Networks Firewall (Software/Hardware)
🔸#fortinet's Fortigate NGFW (Software/Hardware)
🔸#cisco ASA (Hardware)
🔸#azure Cloud-native firewall (Cloud)
🔸#google #cloud Firewall (GCP)
🔸#aws Network Firewall (stateless + stateful) (Hardware/Software)
🔸#linux netfilter/iptables (Software)

2. Stateless FW / Router
Uses data packet's source, destination etc to find if the #data presents threat or not, uses ACL, doesn't look what's inside the packet (doesn't remember anything, so less memory & is faster)
🛡️ Protocols that implement this FW: DNS, UDP, HTTP
🛡️ List of Stateless FW:
🔸Any router can be operated as stateless firewall by defining an ACL

2.1 Circuit-level gateway / Proxy Server
Also a transparent proxy FW or Proxy Server, works as stateless, works at the transport+session layers, examines TCP handshake information found in #TCP/UDP packet headers that is sent between computers to verify that these exchange of packets are sequential, logical & if follows some legitimate rules. Do not inspect inside the packets.
🛡️ Protocols that implement this FW: SOCKS, SOCKS5
🛡️ List of VPNs who uses Socks5:
🔸Oxylabs
🔸Bright Data
🔸Rayobytes
🔸Smartproxy

2.2 Application-level gateway FW
A stateless firewall, also an Application-level proxy, sits between original server & external user, controls traffic, synchronization of information, resource allocation, software response control, does address & port translation.
🛡️ Protocols that implement this FW: SIP, FTP, Telnet, RTSP
🛡️ List of Application-level gateway FW:
🔸Azure Web Application Firewall (WAF) 
🔸AWS WAF
🔸Cloudflare Spectrum
🔸#Nginx
🔸HAProxy
🔸Cloudflare WAF
🔸F5 BIG-IP Advanced WAF

3. Next-generation FW (More capable than stateful)
NGFWs has advanced functions including application awareness, Integrated intrusion prevention systems, identity awareness, bridged+routed modes, threat #intelligence.
🛡️ List of #ngfw:
🔸Fortinet FortiGate (7000 series) (Hardware/Software)
🔸Cisco FirePOWER Series (Hardware)
🔸Palo Alto Networks PA Series (Hardware)
🔸Juniper Networks SRX Series (Hardware)
🔸SonicWall NGFW TZ Series (Hardware)

Storage Critical Design Area for AKS Landing Zone accelerator released.

Use it to help you select the correct storage service for your stateful workload on AKS.

https://learn.microsoft.com/en-us/azure/cloud-adoption-framework/scenarios/app-platform/aks/storage

#K8s #Kubernetes #AKS #Cloud #Stateful #Storage