nanog mailing list archives
Re: IPv4 Router Alert Option
From: Valdis.Kletnieks () vt edu
Date: Fri, 23 May 2008 15:30:11 -0400
On Fri, 23 May 2008 15:00:02 EDT, Ron Bonica said:
Folks, It is my belief that many ISPs, will not accept datagrams containing the Router Alert IP option from customers. Do I have that right? I am asking so that I might better evaluate Internet drafts that would require ISPs to accept such packets.
What you're likely to find in *reality* is that ISPs will be more than happy to pass the packets along, but the corporate/consumer firewalls in place at the ISP's *customers* will stomp on the options (see all the ways that mismanaged firewalls fail to do ingress/egress filtering of rfc1918 packets, or think "ICMP Frag Needed" means "This ICMP needs to be fragged", or...). And it doesn't really matter if it's the ISP or the end site that screws it up - if it gets thrown away, it gets thrown away. Unless you had an ISP-specific use for Router Alert, where end-customer behavior doesn't matter?
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Current thread:
- IPv4 Router Alert Option Ron Bonica (May 23)
- Re: IPv4 Router Alert Option Robert E. Seastrom (May 23)
- Re: IPv4 Router Alert Option Valdis . Kletnieks (May 23)
- Re: IPv4 Router Alert Option Christopher Morrow (May 23)
- Re: IPv4 Router Alert Option Sean Donelan (May 23)