[j-nsp] protect ssh and telnet

[Aaron]

Thanks Chris, but apparently the Juniper ACX5048 is an exception to the lo0 rule…  see link

 

http://kb.juniper.net/InfoCenter/index?page=content <http://kb.juniper.net/InfoCenter/index?page=content&id=KB28893&actp=search&viewlocale=en_US&searchid=1305252358192> &id=KB28893&actp=search&viewlocale=en_US&searchid=1305252358192

 

I’ve been able to accomplish protecting telnet/ssh on my ACX5048 like this…

 

set routing-instances one forwarding-options family inet filter input protect-5048

set firewall family inet filter protect-5048 term 1 from destination-address 1.1.1.1/32

set firewall family inet filter protect-5048 term 1 from protocol tcp

set firewall family inet filter protect-5048 term 1 from destination-port telnet

set firewall family inet filter protect-5048 term 1 from destination-port ssh

set firewall family inet filter protect-5048 term 1 then count protect-5048-counter

set firewall family inet filter protect-5048 term 1 then discard

set firewall family inet filter protect-5048 term 2 then accept

 

1.1.1.0/24 is a subnet on an interface in vrf “one” on my acx5048…

 

The only thing is that I will need to make it a policy with my colleagues that if/when we churn public address space or add new interfaces on our acx5048’s, part of the process will be to add a line to our firewall acl…

 

set firewall family inet filter protect-5048 term 1 from destination-address 1.1.2.1/32

set firewall family inet filter protect-5048 term 1 from destination-address 1.1.3.1/32

etc

 

QUESTION – does anyone know how to make this firewall acl or include a confition or policy somehow to apply the firewall policy to ONLY LOCAL ROUTES (/32’s) ?  that would be nice , so that I would never have to add/subtract specific ip addresses in this firewall policy.

 

Aaron

 

 

 

From: Chris Jones [mailto:ipv6freely at gmail.com] 
Sent: Wednesday, April 13, 2016 10:05 AM
To: Aaron <aaron1 at gvtc.com>
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] protect ssh and telnet

 

To answer OPs actual question:

 

What you're looking for is an RE filter, applied to lo0. A great resource explaining them and some best practices, etc. check out Doug Hank's Day One book: http://www.juniper.net/us/en/training/jnbooks/day-one/fundamentals-series/securing-routing-engine/

 

On Tue, Mar 29, 2016 at 10:26 PM, Aaron <aaron1 at gvtc.com <mailto:aaron1 at gvtc.com> > wrote:

I'm new to Juniper. and I'm looking to protect ssh/telnet on all interfaces
on my juniper ACX5048's.



In Cisco you can protect the virtual interface (vty) with a acl
(access-class) so that any remote login attempts (ssh or telnet) or
protected.



How do I protect ssh and telnet globally in Junos ?  I only want to allow
ssh and telnet from certain trusted management subnets.



Aaron

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-- 

Chris Jones
JNCIE-ENT #272
CCIE# 25655 (R&S)