Hi
Just had an issue on a 60mbps exit where conntrack sessions went over the usual 30000 limit - is this possible for a normal operating exit relay? Is there any default limit set on this or indeed is there a setting intorrc to control the number of sessions?
Cheers Mark B Snaptor.co.uk (non commercial)
On Wed, Jan 4, 2017 at 8:05 AM, Sec INT sec.int9@gmail.com wrote:
Just had an issue on a 60mbps exit where conntrack sessions went over the usual 30000 limit - is this possible for a normal operating exit relay? Is there any default limit set on this or indeed is there a setting intorrc to control the number of sessions?
Yes, it is perfectly normal for an exit to have tens of thousands of active TCP sessions.
An exit doesn't get a lot of use out of a firewall. Your only sockets listening to the public network (netstat -lnt) should be Tor, SSH, and the "this is an exit" page on port 80. fail2ban-type protection for the ssh port *may* be worth it, but I don't see what you would need conntrack for.
zw
Its a limit that many vps suppliers set > 30000 gets you a warning - I'll set the limit to 29k tonight - its only an issue on shared resources like vps
Cheers Mark B Snaptor.co.uk (non commercial)
On 4 Jan 2017, at 13:16, Zack Weinberg zackw@cmu.edu wrote:
On Wed, Jan 4, 2017 at 8:05 AM, Sec INT sec.int9@gmail.com wrote:
Just had an issue on a 60mbps exit where conntrack sessions went over the usual 30000 limit - is this possible for a normal operating exit relay? Is there any default limit set on this or indeed is there a setting intorrc to control the number of sessions?
Yes, it is perfectly normal for an exit to have tens of thousands of active TCP sessions.
An exit doesn't get a lot of use out of a firewall. Your only sockets listening to the public network (netstat -lnt) should be Tor, SSH, and the "this is an exit" page on port 80. fail2ban-type protection for the ssh port *may* be worth it, but I don't see what you would need conntrack for.
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Zack Weinberg