Frequently Asked Questions for FreeBSD 2.X : Networking : 我不能使用 ppp ,我做錯了什麼嗎 ? : Ppp locks up shortly after connecting
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10.7.10. Ppp locks up shortly after connecting

Prior to version 2.2.5 of FreeBSD, it was possible that your link was disabled shortly after connection due to ppp mis-handling Predictor1 compression negotiation. This would only happen if both sides tried to negotiate different Compression Control Protocols (CCP). This problem is now corrected, but if you're still running an old version of ppp, the problem can be circumvented with the line

          disable pred1

Frequently Asked Questions for FreeBSD 2.X : Networking : 我不能使用 ppp ,我做錯了什麼嗎 ? : Ppp locks up shortly after connecting
Previous: LCP negotiations continue 'till the connection is closed
Next: Ppp locks up when I shell out to test it