jlewis@lewis.org wrote:
On Wed, 28 Jul 1999, bryan s. blank wrote:
% ip verify unicast reverse-path % % and according to Paul Ferguson (co-author of RFC 2267) it's in use by % many ISPs. Apparently this is very-low overhead. Paul has also indicated % the use of extended access lists on Cisco routers is very low overhead, % especially on routers using distributed express forwarding.
while i hate to question mr. ferguson, it's my understanding that many isps have found this feature to be unusable due to network design.
I just took out a 7206 by applying ip verify unicast reverse-path to a T3 link on a PA2T3 and attempting to spoof packets from the POP on the other end of that T3.
The 7206 is running c7200-inu-mz.111-25.CC. Fortunately, it rebooted after it crashed.
System restarted by bus error at PC 0x605F88CC, address 0x10024 at 20:29:49 UTC Wed Jul 28 1999
This router had been up over 8 weeks without a crash (ever since Cisco replaced the previous 7206 in this POP that was either posessed or a lemon). The memory is Cisco memory. All the parts came directly from Cisco.
Is this known to be unstable in 111-25.CC? Is it known to be stable in some other release that supports the PAT3, PA2T3, and PA-MCT3?
In a note off-list, Jack Crowder said: "Actually there was a bug in 11.1.26CC. Supposedly, 11.1.27CC has the fix incorporated." I suspect the version of IOS (.25) you're trying to use has whatever bug is referenced as being in .26. -- ----------------------------------------------------------------- Daniel Senie dts@senie.com Amaranth Networks Inc. http://www.amaranthnetworks.com