Once you have your NAT set up, the pix will allow stateful sessions back in through the firewall, ie. If you browse from inside to outside, the session will be allowed back in. Ping (ICMP) is slightly different, it is not a single outgoing session. It is an outgoing packet followed by a separate reply.
Your conduits or access lists are required only to allow incoming sessions, or, (in the case of access-lists) if you require to restrict outgoing sessions. My technical grammar may be a little off the mark, but it should clear up the thought process. Regards, Gaz ""Justin C"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Mark, > > My original question that I sent to the group somehow got lost. Ole was > kind enough to respond to a direct query regarding to some fun I am having > with installing a Pix (501) for the first time. My firewall background is > SonicWall and Watchguard, both are very simple in configuration and work > directly out of the box. > > I was under the impression it was pretty much plug and play, so I decided to > test it by putting it between my PC and the rest of the LAN. However, after > the initial setup, the Pix passed no information through it. So I went to a > ping to start the troubleshooting. The curious (to me) issue was that from > the console or the PDM of the Pix I can ping network addresses on both sides > of the Pix. From the inside of the Pix, I cannot ping (or browse the web) > through the Pix. I cannot even ping the outside interface of the Pix from > the inside interface. The specific question is this ... is additional > configuration of the Pix required to permit access from the inside interface > to the outside interface and beyond? > > To expand on the topic you and Ole are discussing, is the use of the > conduits (or access-lists) required for each and every type of service I > want to send from the inside to the outside? I have no problem researching > the commands to learn how it is done, I just want to make certain I am on > the right path. > > Thanks, > > Justin > > > From: "Mark Odette II" > Reply-To: "Mark Odette II" > To: [EMAIL PROTECTED] > Subject: RE: Question on PIX 501 [7:38246] > Date: Thu, 14 Mar 2002 12:45:59 -0500 > > Forgive me for not reading the book yet, as I've been quite busy too.... > ... but, I have a question in regards to the config line you gave. > > I've used the PDM so far to most of the configuration of my PIX, and it > creates access-lists rather than conduits. I know from others I've talked > with, that Cisco is moving from conduits to access-lists on the PIX > configs... this is the question > > I configure to allow ICMP any(Outside) any(Inside) = Echo Reply > ICMP any(Outside) any(Inside) = Time Exceeded > ICMP any(Outside) any(Inside) = Unreachable > > Does this do the same thing as what you were saying about "conduit permit > any any X"?? > > I think it does, but just want to make sure that I haven't opened up ICMP > completely with it being initiated from the outside. > > Thanks! > Mark > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Ole Drews Jensen > Sent: Thursday, March 14, 2002 10:42 AM > To: [EMAIL PROTECTED] > Subject: RE: Question on PIX 501 [7:38246] > > > Hi Justin, > > When you ping, you use the ICMP protocol. > > When A pings B, A sends ICMP echo-request (number 8) to B, and B sends ICMP > echo-reply (number 0) back to A. > > The PIX does not allow ICMP traffic to come from the outside to the inside, > so to change that, you will need to open up for ICMP number 0 (echo-reply). > > The command for that is: > > conduit permit icmp any any 0 > > This is a good way to do it, because then you allow outside devices to reply > to your request, but they are not allowed to do a PING themself. If you want > PING to work both ways, simply use this command: > > conduit permit icmp any any > > Hth, > > Ole > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Ole Drews Jensen > Systems Network Manager > CCNP, MCSE, MCP+I > RWR Enterprises, Inc. > [EMAIL PROTECTED] > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > http://www.RouterChief.com > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > NEED A JOB ??? > http://www.oledrews.com/job > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > -----Original Message----- > From: Justin C [mailto:[EMAIL PROTECTED]] > Sent: Thursday, March 14, 2002 10:10 AM > To: [EMAIL PROTECTED] > Subject: RE: Question on PIX 501 > > > Ole, > > Thanks for the reply. I understand being busy. I normally try to solve > these things all on my own, but I just don't have the available time. I > spent six hours on it yesterday. > > Justin > > > From: Ole Drews Jensen > To: 'Justin C' > Subject: RE: Question on PIX 501 > Date: Thu, 14 Mar 2002 08:08:30 -0600 > > I did receive the message - I do not know why groupstudy did not. > > I appologize for not getting back with you yesterday, but I am so busy these > days, as there are many projects I have to finish. > > I will see if I can find a couple of minutes to read your entire e-mail from > yesterday, and help you out. > > Try the [EMAIL PROTECTED] again. > > Ole > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Ole Drews Jensen > Systems Network Manager > CCNP, MCSE, MCP+I > RWR Enterprises, Inc. > [EMAIL PROTECTED] > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > http://www.RouterChief.com > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > NEED A JOB ??? > http://www.oledrews.com/job > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > -----Original Message----- > From: Justin C [mailto:[EMAIL PROTECTED]] > Sent: Thursday, March 14, 2002 8:14 AM > To: [EMAIL PROTECTED] > Subject: Question on PIX 501 > > > Ole, > > I apologize in advance for yet another direct message. I am just wondering > if you did get the message regarding the Pix 501 as groupstudy has not. > > I dislike having to message direct, but I am really scratching my head over > this, so anything help you can offer would be greatly appreciated. In a > nutshell, have you worked with a 501. If so, was it plug and play or did > you have to perform additional configurations to get it to work. > > My thanks in advance for your time. > > Justin Cluer > > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp. > > > _________________________________________________________________ > Send and receive Hotmail on your mobile device: http://mobile.msn.com > _________________________________________________________________ > Chat with friends online, try MSN Messenger: http://messenger.msn.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38306&t=38246 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
