How to check if a FTP server supports EPSV (Extended Passive) mode
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From this answer, I now know what is the difference between PASV and EPSV modes. Is there a definitive way of knowing if the FTP server supports EPSV?
Is it enough to just check the response of the EPSV command?
ftp
asked Nov 15 at 7:54
Anirudh Sridhar
82
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up vote
1
down vote
favorite
From this answer, I now know what is the difference between PASV and EPSV modes. Is there a definitive way of knowing if the FTP server supports EPSV?
Is it enough to just check the response of the EPSV command?
ftp
asked Nov 15 at 7:54
Anirudh Sridhar
82
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
From this answer, I now know what is the difference between PASV and EPSV modes. Is there a definitive way of knowing if the FTP server supports EPSV?
Is it enough to just check the response of the EPSV command?
ftp
asked Nov 15 at 7:54
Anirudh Sridhar
82
From this answer, I now know what is the difference between PASV and EPSV modes. Is there a definitive way of knowing if the FTP server supports EPSV?
Is it enough to just check the response of the EPSV command?
ftp
ftp
asked Nov 15 at 7:54
Anirudh Sridhar
82
asked Nov 15 at 7:54
Anirudh Sridhar
82
asked Nov 15 at 7:54
Anirudh Sridhar
82
asked Nov 15 at 7:54
Anirudh Sridhar
82
asked Nov 15 at 7:54
Anirudh Sridhar
82
82
add a comment |
add a comment |
1 Answer
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Send the FEAT command. Defined in RFC 2389, it is the primary mechanism used by clients to discover supported features. IANA maintains a list of FTP commands and their FEAT codes.
If the server says that FEAT itself isn't a recognized command, it is best to assume that the FEAT-negotiated extensions such as EPSV are not supported either.
As for directly trying EPSV (discovery by brute force), it might work in most cases but I think it also has a chance of triggering server or even router bugs, so I wouldn't use this method myself. Besides, you'll probably end up using FEAT for various other reasons anyway.
answered Nov 15 at 8:28
grawity
227k35476539
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
Send the FEAT command. Defined in RFC 2389, it is the primary mechanism used by clients to discover supported features. IANA maintains a list of FTP commands and their FEAT codes.
If the server says that FEAT itself isn't a recognized command, it is best to assume that the FEAT-negotiated extensions such as EPSV are not supported either.
As for directly trying EPSV (discovery by brute force), it might work in most cases but I think it also has a chance of triggering server or even router bugs, so I wouldn't use this method myself. Besides, you'll probably end up using FEAT for various other reasons anyway.
answered Nov 15 at 8:28
grawity
227k35476539
add a comment |
up vote
2
down vote
accepted
Send the FEAT command. Defined in RFC 2389, it is the primary mechanism used by clients to discover supported features. IANA maintains a list of FTP commands and their FEAT codes.
If the server says that FEAT itself isn't a recognized command, it is best to assume that the FEAT-negotiated extensions such as EPSV are not supported either.
As for directly trying EPSV (discovery by brute force), it might work in most cases but I think it also has a chance of triggering server or even router bugs, so I wouldn't use this method myself. Besides, you'll probably end up using FEAT for various other reasons anyway.
answered Nov 15 at 8:28
grawity
227k35476539
add a comment |
up vote
2
down vote
accepted
up vote
2
down vote
accepted
Send the FEAT command. Defined in RFC 2389, it is the primary mechanism used by clients to discover supported features. IANA maintains a list of FTP commands and their FEAT codes.
If the server says that FEAT itself isn't a recognized command, it is best to assume that the FEAT-negotiated extensions such as EPSV are not supported either.
As for directly trying EPSV (discovery by brute force), it might work in most cases but I think it also has a chance of triggering server or even router bugs, so I wouldn't use this method myself. Besides, you'll probably end up using FEAT for various other reasons anyway.
answered Nov 15 at 8:28
grawity
227k35476539
Send the FEAT command. Defined in RFC 2389, it is the primary mechanism used by clients to discover supported features. IANA maintains a list of FTP commands and their FEAT codes.
If the server says that FEAT itself isn't a recognized command, it is best to assume that the FEAT-negotiated extensions such as EPSV are not supported either.
As for directly trying EPSV (discovery by brute force), it might work in most cases but I think it also has a chance of triggering server or even router bugs, so I wouldn't use this method myself. Besides, you'll probably end up using FEAT for various other reasons anyway.
answered Nov 15 at 8:28
grawity
227k35476539
answered Nov 15 at 8:28
grawity
227k35476539
answered Nov 15 at 8:28
grawity
227k35476539
answered Nov 15 at 8:28
grawity
227k35476539
227k35476539
add a comment |
add a comment |
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