From: Narbik Kocharians (narbikk@gmail.com)
Date: Thu Jun 22 2006 - 21:28:53 ART
It depends where the server is located. But remember the following before
making a decision:
Active FTP:
Client starts the FTP connection using a high port as it's source, lets say
2000 and connects to the server's port 21, when the client needs to get data
from the FTP server, it tells the server to use port 2001 (based on the RFC
2000 +1) and *the server initiates a connection* using port 20 as it's
source to the clients port 2001.
Passive FTP:
Client starts the connection using a high port as it's source, lets say 2000
and connects to the server's port 21, when the client needs to get data from
the FTP server, the FTP server tells the client the high port that the
client should use for the data transfer, the client adds one to it's
existing high port (based on RFC 2000+1) and *the client initiates a
connection* to the server's port 20.
Now if you go through the steps you will see that the location of the client
and server is very important.
Let's say you have configured RACL and Active (Regular) FTP:
Client is in on the Inside and the server is on the Outside network:
Remember with RACL, all inbound connections are denied, therefore when the
client initiates the connection, the return traffic for the first connection
is allowed and this is from client's port 2000 to the server's port 21. But
when the server wants to initiate the second connection to client's port
2001 using it's port 20, the traffic is denied, because the RACL that's
configured on the router will deny new connections from the Outside networks
to Inside networks.
If the location of the client and the server is reversed (Client is on the
Outside and the server is on the Inside), the client won't be able to
initiate the call to server's port 21.
Let's say you have configured RACL and Passive FTP:
Client is in on the Inside and the server is on the Outside network:
Since the client initiates both connections, you won't have any problems,
because for every connection that the client initiates from Inside network
to the Outside network, RACL will create the return traffic.
But if the roles are reversed, meaning that the client is on the Outside and
the server is on Inside, the client's call to port 21 will be denied.
I hope I have not confused you guys.
Narbik Kocharians
CCIE# 12410 (R&S, SP, Security)
CCSI# 30832
Network Learning, Inc. (CCIE class Instructor)
www.ccbootcamp.com (CCIE Training)
- Show quoted text -
On 6/22/06, Petr Lapukhov <petr@internetworkexpert.com> wrote:
>
> Reflexive ACLs work nice with passive FTP, but they are not of a big
> help with active mode. .
>
> The best thing to track active mode connections is CBAC feature :)
>
> --
> Petr Lapukhov, CCIE #16379
> petr@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> Toll Free: 877-224-8987
> Outside US: 775-826-4344
>
> 2006/6/22, Navin MS <navin_ms07@yahoo.com>:
> >
> > Group,
> >
> > Is it possible that we can use a reflexive ACL for this ?
> >
> > IMP, the inbound and outbound traffic is just the mirror of each other.
> > So just "reflect" in the outbound ACL and do an "evaluate" in the
> inbound
> > ?
> >
> > Does that simplify this task ?
> >
> > Thanks,
> > Naveen.
> >
> >
> >
> > --- Chris Lewis <chrlewiscsco@gmail.com> wrote:
> >
> > > Ignore my comment on this, I need to clean my glasses so I can read
> the
> > > diagram properly.
> > >
> > > Chris
> > >
> > >
> > > On 6/22/06, Popgeorgiev Nikolay <nikolay.popgeorgiev@siemens.com >
> wrote:
> > > >
> > > > Chris,
> > > >
> > > > Sorry but can you explain me how exactly port 20 is used in the
> > PASSIVE
> > > > mode of ftp. Maybe I don't understand something ?
> > > >
> > > >
> > > > According to the access lists matching both types of ftp it should
> be
> > > > something like this:
> > > >
> > > > Active
> > > >
> > > > Access-list 101 permit tcp host mypc host SRV eq 21
> > > > Access-list 101 permit tcp host mypc host SRV eq 20
> > > >
> > > > Access-list 102 permit tcp host SRV eq 21 host mypc
> > > > Access-list 102 permit tcp host SRV eq 20 host mypc
> > > >
> > > >
> > > > Passive
> > > >
> > > > Access-list 101 permit tcp host mypc host SRV eq 21
> > > > Access-list 101 permit tcp host mypc host SRV gt 1023
> > > >
> > > > Access-list 102 permit tcp host SRV eq 21 host mypc
> > > > Access-list 102 permit tcp host SRV gt 1023 host mypc
> > > >
> > > >
> > > >
> > > > Best,
> > > > Nick
> > > >
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Chris Lewis [mailto: chrlewiscsco@gmail.com]
> > > > Sent: Thursday, June 22, 2006 4:00 AM
> > > > To: Plank, Jason
> > > > Cc: Ken; Cisco certification
> > > > Subject: Re: FTP connection type
> > > >
> > > > Well, both passive and active use ports 20 and 21.
> > > >
> > > >
> > >
> >
> >
> http://www.cisco.com/web/about/ac123/ac147/ac174/ac199/about_cisco_ipj_archive_article09186a00800c85a7.html
> > > >
> > > >
> > > > Provides a full description.
> > > >
> > > > Chris
> > > >
> > > >
> > > > On 6/21/06, Plank, Jason <JPlank@concordefs.com> wrote:
> > > > >
> > > > > It means ACTIVE FTP, which uses TCP ports 20/21.
> > > > >
> > > > > -------------------
> > > > > J. Marshall Plank
> > > > > Network Engineer
> > > > > 101 Bellevue Parkway
> > > > > Wilmington, DE 19809
> > > > > E-mail: JPlank@concordefs.com
> > > > > Phone: 302-793-5913
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com ] On
> > Behalf Of
> > > > > Ken
> > > > > Sent: Wednesday, June 21, 2006 6:11 PM
> > > > > To: Cisco certification
> > > > > Subject: FTP connection type
> > > > >
> > > > > Hello,
> > > > >
> > > > > When there is a statement, "suppose that this FTP server does not
> > > > > support PASV FTP connection", what kind of difference does it make
> > > > > in the ACL configuration?
> > > > >
> > > > > I am referring to the QoS question 8.3 in Lab 2 of IE work book.
> > > > >
> > > > > Thanks,
> > > > >
> > > > >
> > _______________________________________________________________________
> > > > > Subscription information may be found at:
> > > > > http://www.groupstudy.com/list/CCIELab.html
> > > > >
> > > > > -----------------------------------------
> > > > > The information in this message may be proprietary and/or
> > > > > confidential, and protected from disclosure. If the reader of
> this
> > > > > message is not the intended recipient, or an employee or agent
> > > > > responsible for delivering this message to the intended recipient,
> > > > > you are hereby notified that any dissemination, distribution or
> > > > > copying of this communication is strictly prohibited. If you have
> > > > > received this communication in error, please notify First Data
> > > > > immediately by replying to this message and deleting it from your
> > > > > computer.
> > > > >
> > > > >
> > _______________________________________________________________________
> > > > > Subscription information may be found at:
> > > > > http://www.groupstudy.com/list/CCIELab.html
> > > >
> > > >
> > _______________________________________________________________________
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> > >
> > >
> _______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> > >
> >
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Tired of spam? Yahoo! Mail has the best spam protection around
> > http://mail.yahoo.com
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
On 6/22/06, Narbik Kocharians <narbikk@gmail.com> wrote:
>
> It depends where the server is located. But remember the following
> before making a decision:
>
>
>
> Active FTP:
>
> Client starts the FTP connection using a high port as it's source, lets
> say 2000 and connects to the server's port 21, when the client needs to get
> data from the FTP server, it tells the server to use port 2001 (based on the
> RFC 2000 +1) and *the server initiates a connection* using port 20 as it's
> source to the clients port 2001.
>
>
>
> Passive FTP:
>
> Client starts the connection using a high port as it's source, lets say
> 2000 and connects to the server's port 21, when the client needs to get data
> from the FTP server, the FTP server tells the client the high port that the
> client should use for the data transfer, the client adds one to it's
> existing high port (based on RFC 2000+1) and *the client initiates a
> connection* to the server's port 20.
>
>
>
> Now if you go through the steps you will see that the location of the
> client and server is very important.
>
> Let's say you have configured RACL and Active (Regular) FTP:
>
> Client is in on the Inside and the server is on the Outside network:
>
> Remember with RACL, all inbound connections are denied, therefore when the
> client initiates the connection, the return traffic for the first connection
> is allowed and this is from client's port 2000 to the server's port 21. But
> when the server wants to initiate the second connection to client's port
> 2001 using it's port 20, the traffic is denied, because the RACL that's
> configured on the router will deny new connections from the Outside networks
> to Inside networks.
>
> If the location of the client and the server is reversed (Client is on the
> Outside and the server is on the Inside), the client won't be able to
> initiate the call to server's port 21.
>
>
>
> Let's say you have configured RACL and Passive FTP:
>
> Client is in on the Inside and the server is on the Outside network:
>
>
>
> Since the client initiates both connections, you won't have any problems,
> because for every connection that the client initiates from Inside network
> to the Outside network, RACL will create the return traffic.
>
> But if the roles are reversed, meaning that the client is on the Outside
> and the server is on Inside, the client's call to port 21 will be denied.
>
> I hope I have not confused you guys.
>
>
>
>
>
>
>
> Narbik Kocharians
>
> CCIE# 12410 (R&S, SP, Security)
>
> CCSI# 30832
>
> Network Learning, Inc. (CCIE class Instructor)
>
> www.ccbootcamp.com (CCIE Training)
> - Show quoted text -
>
>
> On 6/22/06, Petr Lapukhov <petr@internetworkexpert.com > wrote:
> >
> > Reflexive ACLs work nice with passive FTP, but they are not of a big
> > help with active mode. .
> >
> > The best thing to track active mode connections is CBAC feature :)
> >
> > --
> > Petr Lapukhov, CCIE #16379
> > petr@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> > Toll Free: 877-224-8987
> > Outside US: 775-826-4344
> >
> > 2006/6/22, Navin MS <navin_ms07@yahoo.com>:
> > >
> > > Group,
> > >
> > > Is it possible that we can use a reflexive ACL for this ?
> > >
> > > IMP, the inbound and outbound traffic is just the mirror of each
> > other.
> > > So just "reflect" in the outbound ACL and do an "evaluate" in the
> > inbound
> > > ?
> > >
> > > Does that simplify this task ?
> > >
> > > Thanks,
> > > Naveen.
> > >
> > >
> > >
> > > --- Chris Lewis <chrlewiscsco@gmail.com > wrote:
> > >
> > > > Ignore my comment on this, I need to clean my glasses so I can read
> > the
> > > > diagram properly.
> > > >
> > > > Chris
> > > >
> > > >
> > > > On 6/22/06, Popgeorgiev Nikolay < nikolay.popgeorgiev@siemens.com >
> > wrote:
> > > > >
> > > > > Chris,
> > > > >
> > > > > Sorry but can you explain me how exactly port 20 is used in the
> > > PASSIVE
> > > > > mode of ftp. Maybe I don't understand something ?
> > > > >
> > > > >
> > > > > According to the access lists matching both types of ftp it should
> > be
> > > > > something like this:
> > > > >
> > > > > Active
> > > > >
> > > > > Access-list 101 permit tcp host mypc host SRV eq 21
> > > > > Access-list 101 permit tcp host mypc host SRV eq 20
> > > > >
> > > > > Access-list 102 permit tcp host SRV eq 21 host mypc
> > > > > Access-list 102 permit tcp host SRV eq 20 host mypc
> > > > >
> > > > >
> > > > > Passive
> > > > >
> > > > > Access-list 101 permit tcp host mypc host SRV eq 21
> > > > > Access-list 101 permit tcp host mypc host SRV gt 1023
> > > > >
> > > > > Access-list 102 permit tcp host SRV eq 21 host mypc
> > > > > Access-list 102 permit tcp host SRV gt 1023 host mypc
> > > > >
> > > > >
> > > > >
> > > > > Best,
> > > > > Nick
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > > From: Chris Lewis [mailto: chrlewiscsco@gmail.com ]
> > > > > Sent: Thursday, June 22, 2006 4:00 AM
> > > > > To: Plank, Jason
> > > > > Cc: Ken; Cisco certification
> > > > > Subject: Re: FTP connection type
> > > > >
> > > > > Well, both passive and active use ports 20 and 21.
> > > > >
> > > > >
> > > >
> > >
> > >
> > http://www.cisco.com/web/about/ac123/ac147/ac174/ac199/about_cisco_ipj_archive_article09186a00800c85a7.html
> > > > >
> > > > >
> > > > > Provides a full description.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > On 6/21/06, Plank, Jason <JPlank@concordefs.com> wrote:
> > > > > >
> > > > > > It means ACTIVE FTP, which uses TCP ports 20/21.
> > > > > >
> > > > > > -------------------
> > > > > > J. Marshall Plank
> > > > > > Network Engineer
> > > > > > 101 Bellevue Parkway
> > > > > > Wilmington, DE 19809
> > > > > > E-mail: JPlank@concordefs.com
> > > > > > Phone: 302-793-5913
> > > > > >
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com ] On
> > > Behalf Of
> > > > > > Ken
> > > > > > Sent: Wednesday, June 21, 2006 6:11 PM
> > > > > > To: Cisco certification
> > > > > > Subject: FTP connection type
> > > > > >
> > > > > > Hello,
> > > > > >
> > > > > > When there is a statement, "suppose that this FTP server does
> > not
> > > > > > support PASV FTP connection", what kind of difference does it
> > make
> > > > > > in the ACL configuration?
> > > > > >
> > > > > > I am referring to the QoS question 8.3 in Lab 2 of IE work book.
> > > > > >
> > > > > > Thanks,
> > > > > >
> > > > > >
> > >
> > _______________________________________________________________________
> > > > > > Subscription information may be found at:
> > > > > > http://www.groupstudy.com/list/CCIELab.html
> > > > > >
> > > > > > -----------------------------------------
> > > > > > The information in this message may be proprietary and/or
> > > > > > confidential, and protected from disclosure. If the reader of
> > this
> > > > > > message is not the intended recipient, or an employee or agent
> > > > > > responsible for delivering this message to the intended
> > recipient,
> > > > > > you are hereby notified that any dissemination, distribution or
> > > > > > copying of this communication is strictly prohibited. If you
> > have
> > > > > > received this communication in error, please notify First Data
> > > > > > immediately by replying to this message and deleting it from
> > your
> > > > > > computer.
> > > > > >
> > > > > >
> > >
> > _______________________________________________________________________
> > > > > > Subscription information may be found at:
> > > > > > http://www.groupstudy.com/list/CCIELab.html
> > > > >
> > > > >
> > >
> > _______________________________________________________________________
> > > > > Subscription information may be found at:
> > > > > http://www.groupstudy.com/list/CCIELab.html
> > > >
> > > >
> > _______________________________________________________________________
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> > > >
> > >
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Tired of spam? Yahoo! Mail has the best spam protection around
> > > http://mail.yahoo.com
> > >
> > >
> > _______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
>
>
>
> On 6/22/06, Narbik Kocharians <narbikk@gmail.com> wrote:
> >
> > It depends where the server is located. But remember the following
> > before making a decision:
> >
> >
> >
> > Active FTP:
> >
> > Client starts the FTP connection using a high port as it's source, lets
> > say 2000 and connects to the server's port 21, when the client needs to get
> > data from the FTP server, it tells the server to use port 2001 (based on the
> > RFC 2000 +1) and *the server initiates a connection* using port 20 as
> > it's source to the clients port 2001.
> >
> >
> >
> > Passive FTP:
> >
> > Client starts the connection using a high port as it's source, lets say
> > 2000 and connects to the server's port 21, when the client needs to get data
> > from the FTP server, the FTP server tells the client the high port that the
> > client should use for the data transfer, the client adds one to it's
> > existing high port (based on RFC 2000+1) and *the client initiates a
> > connection* to the server's port 20.
> >
> >
> >
> > Now if you go through the steps you will see that the location of the
> > client and server is very important.
> >
> > Let's say you have configured RACL and Active (Regular) FTP:
> >
> > Client is in on the Inside and the server is on the Outside network:
> >
> > Remember with RACL, all inbound connections are denied, therefore when
> > the client initiates the connection, the return traffic for the first
> > connection is allowed and this is from client's port 2000 to the server's
> > port 21. But when the server wants to initiate the second connection to
> > client's port 2001 using it's port 20, the traffic is denied, because the
> > RACL that's configured on the router will deny new connections from the
> > Outside networks to Inside networks.
> >
> > If the location of the client and the server is reversed (Client is on
> > the Outside and the server is on the Inside), the client won't be able to
> > initiate the call to server's port 21.
> >
> >
> >
> > Let's say you have configured RACL and Passive FTP:
> >
> > Client is in on the Inside and the server is on the Outside network:
> >
> >
> >
> > Since the client initiates both connections, you won't have any
> > problems, because for every connection that the client initiates from Inside
> > network to the Outside network, RACL will create the return traffic.
> >
> > But if the roles are reversed, meaning that the client is on the Outside
> > and the server is on Inside, the client's call to port 21 will be denied.
> >
> > I hope I have not confused you guys.
> >
> >
> >
> >
> >
> >
> >
> > Narbik Kocharians
> >
> > CCIE# 12410 (R&S, SP, Security)
> >
> > CCSI# 30832
> >
> > Network Learning, Inc. (CCIE class Instructor)
> >
> > www.ccbootcamp.com (CCIE Training)
> >
> >
> > On 6/22/06, Petr Lapukhov <petr@internetworkexpert.com > wrote:
> > >
> > > Reflexive ACLs work nice with passive FTP, but they are not of a big
> > > help with active mode. .
> > >
> > > The best thing to track active mode connections is CBAC feature :)
> > >
> > > --
> > > Petr Lapukhov, CCIE #16379
> > > petr@internetworkexpert.com
> > >
> > > Internetwork Expert, Inc.
> > > http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
> > > Toll Free: 877-224-8987
> > > Outside US: 775-826-4344
> > >
> > > 2006/6/22, Navin MS <navin_ms07@yahoo.com>:
> > > >
> > > > Group,
> > > >
> > > > Is it possible that we can use a reflexive ACL for this ?
> > > >
> > > > IMP, the inbound and outbound traffic is just the mirror of each
> > > other.
> > > > So just "reflect" in the outbound ACL and do an "evaluate" in the
> > > inbound
> > > > ?
> > > >
> > > > Does that simplify this task ?
> > > >
> > > > Thanks,
> > > > Naveen.
> > > >
> > > >
> > > >
> > > > --- Chris Lewis <chrlewiscsco@gmail.com > wrote:
> > > >
> > > > > Ignore my comment on this, I need to clean my glasses so I can
> > > read the
> > > > > diagram properly.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > On 6/22/06, Popgeorgiev Nikolay < nikolay.popgeorgiev@siemens.com> wrote:
> > > > > >
> > > > > > Chris,
> > > > > >
> > > > > > Sorry but can you explain me how exactly port 20 is used in the
> > > > PASSIVE
> > > > > > mode of ftp. Maybe I don't understand something ?
> > > > > >
> > > > > >
> > > > > > According to the access lists matching both types of ftp it
> > > should be
> > > > > > something like this:
> > > > > >
> > > > > > Active
> > > > > >
> > > > > > Access-list 101 permit tcp host mypc host SRV eq 21
> > > > > > Access-list 101 permit tcp host mypc host SRV eq 20
> > > > > >
> > > > > > Access-list 102 permit tcp host SRV eq 21 host mypc
> > > > > > Access-list 102 permit tcp host SRV eq 20 host mypc
> > > > > >
> > > > > >
> > > > > > Passive
> > > > > >
> > > > > > Access-list 101 permit tcp host mypc host SRV eq 21
> > > > > > Access-list 101 permit tcp host mypc host SRV gt 1023
> > > > > >
> > > > > > Access-list 102 permit tcp host SRV eq 21 host mypc
> > > > > > Access-list 102 permit tcp host SRV gt 1023 host mypc
> > > > > >
> > > > > >
> > > > > >
> > > > > > Best,
> > > > > > Nick
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: Chris Lewis [mailto: chrlewiscsco@gmail.com ]
> > > > > > Sent: Thursday, June 22, 2006 4:00 AM
> > > > > > To: Plank, Jason
> > > > > > Cc: Ken; Cisco certification
> > > > > > Subject: Re: FTP connection type
> > > > > >
> > > > > > Well, both passive and active use ports 20 and 21.
> > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > > http://www.cisco.com/web/about/ac123/ac147/ac174/ac199/about_cisco_ipj_archive_article09186a00800c85a7.html
> > > > > >
> > > > > >
> > > > > > Provides a full description.
> > > > > >
> > > > > > Chris
> > > > > >
> > > > > >
> > > > > > On 6/21/06, Plank, Jason <JPlank@concordefs.com> wrote:
> > > > > > >
> > > > > > > It means ACTIVE FTP, which uses TCP ports 20/21.
> > > > > > >
> > > > > > > -------------------
> > > > > > > J. Marshall Plank
> > > > > > > Network Engineer
> > > > > > > 101 Bellevue Parkway
> > > > > > > Wilmington, DE 19809
> > > > > > > E-mail: JPlank@concordefs.com
> > > > > > > Phone: 302-793-5913
> > > > > > >
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com ] On
> > > > Behalf Of
> > > > > > > Ken
> > > > > > > Sent: Wednesday, June 21, 2006 6:11 PM
> > > > > > > To: Cisco certification
> > > > > > > Subject: FTP connection type
> > > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > > When there is a statement, "suppose that this FTP server does
> > > not
> > > > > > > support PASV FTP connection", what kind of difference does it
> > > make
> > > > > > > in the ACL configuration?
> > > > > > >
> > > > > > > I am referring to the QoS question 8.3 in Lab 2 of IE work
> > > book.
> > > > > > >
> > > > > > > Thanks,
> > > > > > >
> > > > > > >
> > > >
> > > _______________________________________________________________________
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