nanog mailing list archives
RE: private ip addresses from ISP
From: "David Schwartz" <davids () webmaster com>
Date: Wed, 17 May 2006 10:37:03 -0700
Our router is running BGP and connecting to our upstream provider with /30 network. Our log reveals that there are private IP addresses reaching our router's interface that is facing our upstream ISP. How could this be possible? Should upstream ISP be blocking private IP address according to standard configuration? Could the packet be stripped and IP be converted somehow during the transition? It happens in many Tier-1 ISP though ! Thank you for your information
Do you mean: 1) You are seeing BGP routes for addresses inside private space? 2) You are seeing packets with destination IPs inside private space arriving at your interface from your ISP? 3) You are seeing packets with source IPs inside private space arriving at your interface from your ISP? If 1, feel free to filter them. You ISP probably uses them internally and is leaking them to you. Feel free to complain if you want. If 2, make sure you aren't advertising routes into RFC1918 space to your ISP. If not, you should definitely ask them what's up. If 3, that's normal. These are packets your ISP received that are addressed to you and the ISP is leaving to you the decision of whether to accept them or not. Feel free to filter them out if you wish. (It won't break anything that's not already broken.) DS
Current thread:
- private ip addresses from ISP adrian kok (May 17)
- RE: private ip addresses from ISP Ivan Groenewald (May 17)
- RIPE IP Anti-Spoofing Task Force (Was: private ip addresses from ISP) Jeroen Massar (May 17)
- RE: private ip addresses from ISP David Schwartz (May 17)
- <Possible follow-ups>
- RE: private ip addresses from ISP Andrew Kirch (May 22)
- Re: private ip addresses from ISP Hyunseog Ryu (May 22)
- Re: private ip addresses from ISP Richard A Steenbergen (May 23)
- Re: private ip addresses from ISP Edward B. DREGER (May 23)
- Re: private ip addresses from ISP Patrick W. Gilmore (May 23)
- Re: private ip addresses from ISP Richard A Steenbergen (May 23)
- Re: private ip addresses from ISP sthaug (May 23)
- Re: private ip addresses from ISP Patrick W. Gilmore (May 23)
- RE: private ip addresses from ISP Ivan Groenewald (May 17)
- Re: private ip addresses from ISP Daniel Senie (May 23)