Firewall Wizards mailing list archives
Re: PIX 6.1 xlate issues
From: "Christopher J. Wargaski" <wargo1 () gmail com>
Date: Thu, 4 Sep 2008 00:14:42 -0500
Hello Shiv-- I recently saw a PIX 515E become so overwhelmed with the number of NAT translations that it exhausted the memory it had and pretty much stopped passing traffic until the dynamic NAT table was cleared. It turns out that a virus on the inside had infected a handful of Billy Boxes and was sending connection requests on TCP port 445. I solved this by explicitly denying that outbound destination port. First of all, do you have an outbound ACL? If not, create one explicitly permitting the known outbound traffic. If that is still a problem, or you already do have an outbound ACL, then capture some level 7 logs from the PIX and have a look. Are there connection requests to ports that you would not expect? Oh, BTW, I think that I discovered the memory shortage based upon the show xlate count, a log entry and the show mem output. On Wed, Aug 20, 2008 at 1:02 AM, B Shivanthan <shivi () batelco com bh> wrote:
Hello there, I am using a PIX 6.1 (I know its quite old and replacement procedures already in place) and facing problems with xlates getting overwhelmed. I have this firewall serving our corporate network, where I have a proxy server, SMTP server, DNS server and about 1500 users browsing the web through the proxy, along with other servers which I do static NAT on. Overtime, my SMTP server loses connectivity with the DNS server (residing outside the firewall) for name resolution and the only remedy to this is to clear the xlate. I've set the xlate timeout to as low as 30 mins, but the problem still persist. Does anyone know of any resolution to this problem ? Many thanks Regards Shiv _______________________________________________ firewall-wizards mailing list firewall-wizards () listserv icsalabs com https://listserv.icsalabs.com/mailman/listinfo/firewall-wizards
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Current thread:
- PIX 6.1 xlate issues B Shivanthan (Sep 03)
- Re: PIX 6.1 xlate issues kevin horvath (Sep 04)
- Re: PIX 6.1 xlate issues Christopher J. Wargaski (Sep 04)