2005/10/17
Pense numa cultura inútil ;)
Mais um "braindump" sobre problemas NP-completos aqui. Espero que interesse a alguém. Correções e adições também são bem-vindas.
2005/10/04
PySCTP version 0.2
We are pleased to announce version 0.2 of PySCTP: Python bindings for POSIX SCTP protocol stacks. Download from http://www.epx.com.br/pysctp/
For those not familiar of SCTP (Stream Control Transmission Protocol), it is a relatively new transport protocol for the TCP/IP stack. Most people understand it as a "cross-over" between TCP and UDP, because it sends indivisible messages (analogous to UDP datagrams) instead of a byte stream. But the messages can be reliable in several levels, including perfect reliability pretty much like TCP. It also has a lot of new pretty features and security improvements, absorbed from the last 30 years of Internet experience.
SCTP was originally conceived for telephony signalling transport, and it is widely used in IP-based telecoms. (Do not confuse this with VoIP - IP-based telecoms still transmit content data (voice, ISDN etc.) over circuit-oriented networks, and use SS7 protocols over IP. VoIP is the use of TCP/IP for the content, probably using SIP or H.323 in place of SS7).
The extra features of SCTP impose a lot of API extensions on Sockets, and traditional Python sockets can not access most of these extensions. The mission of PySCTP is to make those extensions available, at least in POSIX-compliant operating systems (for now, we just make tests on Linux, however).
For those not familiar of SCTP (Stream Control Transmission Protocol), it is a relatively new transport protocol for the TCP/IP stack. Most people understand it as a "cross-over" between TCP and UDP, because it sends indivisible messages (analogous to UDP datagrams) instead of a byte stream. But the messages can be reliable in several levels, including perfect reliability pretty much like TCP. It also has a lot of new pretty features and security improvements, absorbed from the last 30 years of Internet experience.
SCTP was originally conceived for telephony signalling transport, and it is widely used in IP-based telecoms. (Do not confuse this with VoIP - IP-based telecoms still transmit content data (voice, ISDN etc.) over circuit-oriented networks, and use SS7 protocols over IP. VoIP is the use of TCP/IP for the content, probably using SIP or H.323 in place of SS7).
The extra features of SCTP impose a lot of API extensions on Sockets, and traditional Python sockets can not access most of these extensions. The mission of PySCTP is to make those extensions available, at least in POSIX-compliant operating systems (for now, we just make tests on Linux, however).
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