Date: Fri, 16 Feb 2007 21:23:48 GMT From: Ingo Flaschberger<if@xip.at> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/109246: ICMP rejects are not generated with fastforwarding enabled Message-ID: <200702162123.l1GLNmrZ040432@www.freebsd.org> Resent-Message-ID: <200702162130.l1GLU3cf063097@freefall.freebsd.org>
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>Number: 109246 >Category: kern >Synopsis: ICMP rejects are not generated with fastforwarding enabled >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Feb 16 21:30:03 GMT 2007 >Closed-Date: >Last-Modified: >Originator: Ingo Flaschberger >Release: 6.1-RELEASE-p12 >Organization: >Environment: i386 >Description: In the routingtable is a blackhole reject route: Destination Gateway Flags Refs Use Netif Expire 192.168.0/16 127.0.0.1 UGR1 0 0 lo0 With fastforwarding disabled, a ICMP reject is generated: traceroute to 192.168.200.1 (192.168.200.1), 30 hops max, 38 byte packets 1 10.0.0.175 (10.0.0.175) 2.752 ms 0.231 ms 0.208 ms 2 10.0.0.175 (10.0.0.175) 0.224 ms !H 0.187 ms !H 0.193 ms !H With fastforwarding enabled, not: traceroute to 192.168.200.1 (192.168.200.1), 30 hops max, 38 byte packets 1 10.0.0.175 (10.0.0.175) 0.620 ms 0.214 ms 0.142 ms 2 * * * 3 * * * 4 * * * >How-To-Repeat: No problem: At the router: sysctl -w net.inet.ip.forwarding=1 route add -net 192.168.0.0/8 lo0 -reject -nostatic -proto1 At another machine: route add -net 192.168.100.0/24 gateway <ipoftherouter> traceroute 192.168.101.1 Problem: At the router: sysctl -w net.inet.ip.fastforwarding=1 At another machine: traceroute 192.168.101.1 >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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