Re: 2 PIXes with their interfaces sharing the same switch andon the same VLAN.

[<lordchariot () embarqmail com>]

When you see pings get through, but TCP sessions do not, it's usually traced
down to statefulness and/or asymmetric routing.
I don't do PIX/ASA, but I've run into this before on other firewalls.
Something is not going out the same door it came in.


> -----Original Message-----
> From: firewall-wizards-bounces () listserv icsalabs com [mailto:firewall-
> wizards-bounces () listserv icsalabs com] On Behalf Of Scott Stursa
> Sent: Saturday, August 01, 2009 2:08 PM
> To: rudy () rudal com; Firewall Wizards Security Mailing List
> Cc: firewall-wizards () listserv icsalabs com
> Subject: Re: [fw-wiz] 2 PIXes with their interfaces sharing the same
> switch andon the same VLAN.
>
>
> Rudy Setiawan said:
> > Hi all,
> >
> > I have some problem that I need some solution/advice :)
> >
> > I have two PIX'es
> > * PIX A WAN is connected to Provider A
> > * PIX B WAN is connected to Provider B
> > * PIX A inside interface has the IP address of 10.15.1.1
> > * PIX B DMZ interface has the IP address of 10.15.1.2
> > * PIX B inside interface has the IP address of 10.17.1.1
> > * Subnet mask for all of the IP addresses 255.255.0.0 or /16
> >
> > I disabled nat by way of nat 0 access-list to both PIXes and the
> > interfaces
> > as well (except the WAN).
> > I have a "ip permit any any" applied to all interfaces except the WAN,
> >
> > A user with IP 10.17.1.2 has a gateway of 10.17.1.1 is able to ping a
> > server
> > in 10.15.1.10 (the server has a gateway of 10.15.1.1) but is unable to
> ssh
> > to the server.
> > But if I changed the gateway of the server to 10.15.1.2, then the user
> is
> > able to ssh to the server.
> >
> > What am I doing wrong here?
>
> Does PIX A have an explicit route defined for 10.17.0.0/16? If not, then
> it's probably sending the server's packets out to the provider (how the
> ICMP echo replies get back to 10.17.1.2 is a bit mysterious). Try adding a
> route to PIX A for 10.17.0.0/16 pointing to 10.15.1.2.
>
> --
> It's not having what you want.
> It's wanting what you've got.
>                  - Sheryl Crow
>
> Scott L. Stursa
> CISSP, CCNP, MCSA
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> firewall-wizards () listserv icsalabs com
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