ALG breaking a Transfer Zone

This came when i tried to do a DNS Transfer Zone through a Cisco SOHO (877), which when triggered i received a RST packet from the router. Initially i was thinking that came from the server, but looking to the packet capture i observed the TTL was 254, which was the from router it self. … Read more

Notas Estudo BCVRE 170-010 parte 3

Chapter 7 NAT 3 tipos de NAT: Source NAT Destination NAT Bidirectional NAT – combina a source e destination NAT para translation em ambas as direções NAT Rulebases O NAT usa rulebases diferentes para cada tipo de NAT, as rulebases são ordenadas numericamente e quando e feito um match o vRouter termina a execução da … Read more

Check Point Order of Operations

Após alguma pesquisa a Check Point não é muito clara neste tema nas plataformas mais recentes. Este “Order of Operations” aplica-se ao FireWall-1 , e eventualmente ás novas plataformas. Ligações estabelecidas são permitidas desde que estejam listados nas tabelas de estado e são aceites NATED conforme necessário. Para novas conexões, o FireWall-1 segue esta ordem … Read more

Notas Network Address Translation (NAT)

O NAT é definido no RFC 1631 Name Location of Host Represented by Address IP Address Space in Which Address Exists Inside Local address Inside the enterprise network Part of the enterprise IP address space;typically a private IP address Inside Global address Inside the enterprise network Part of the public IP address space Outside Local … Read more

Cisco Order of Operations

Existem 2 tabelas importantes que indicam a ordem das operações no IOS são a do NAT e QoS. Operações no NAT: Inside-to-Outside Outside-to-Inside If IPSec then check input access list decryption – for CET (Cisco Encryption Technology) or IPSec check input access list check input rate limits input accounting redirect to web cache policy routing … Read more

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