Ahh, Yep, same thing port and/or protocol for an address range. I haven't seen that accomplished via BGP. I know ATT will do it - they want about 2K more per month for that ability. All your traffic is redirected (extra hops ) through a firewall. So, it's a basic expensive firewall service. We have done both port based and protocol. But it gets installed by hand only on the connected port the customer. Bob Evans CTO Fiber Internet Center
Not specific ports, but something more like:
'deny udp any my.target.slash.25 0.0.255.255'
BGP blackholing will obviously impact all traffic to a target.
-chris
2014-05-12 15:20 GMT-07:00 Bob Evans <bob@fiberinternetcenter.com>:
Are you asking a transit network to filter specific ports as an end user or as an ISP who has Level 3 as a transit provider?
I haven't seen a specific port could be dropped by any network....Only aware of BGP community string like, 3356:9999 - black hole (discard all traffic for specific IP range) traffic type abilities.
We have and will filter specific ports for customers. But this port type ACL is completed by hand....I haven't seen anyone implement this using a BGP community string.
Bob Evans CTO Fiber Internet CenterThank You Bob Evans CTO
We contacted Level3 a few weeks back, and were told that they do not provide any filtering service. I've not been able to confirm this from anyone else, besides the Level3 customer service rep we spoke with.
Currently looking into a DDoS protection service from Akamai. Sounds awesome what they can do, but often "awesome" translates to "overkill" and/or "too expensive".
-Petter
-----Original Message----- From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Christopher Rogers Sent: Monday, May 12, 2014 2:47 PM To: nanog@nanog.org Subject: level3 dia egress filtering?
Does anyone have any experience dealing with level3 in trying to get egress filters applied to an internet dia link with them?
I've been trying to get them to apply an egress filter to drop all of udp to a certain /25 on my network that's been getting hammered by a dns amplification attack, and I am being told that they can only 'drop an entire protocol, and not to a specific ip address or range.'
Can anyone confirm if that's the case?
cheers -chris