Date: Fri, 10 Jul 2009 14:35:29 +0200 From: Henri Hennebert <hlh@restart.be> To: freebsd-stable@freebsd.org, freebsd-net@freebsd.org Subject: 8.0-BETA1 - for the record - different paths followed by IPv4 and IPv6 for 'local' connections Message-ID: <4A573591.1000506@restart.be>
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Hello, After upgrading from 7.2-STABLE to 8.0-BETA1 I encounter a problem when connecting with firefox to a local apache server using the global unicast IPv6 address of the local machine. pf.conf must be updated! My configuration: [root@avoriaz ~]# ifconfig em0 em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4> ether 00:1d:60:ad:2a:ce inet 192.168.24.1 netmask 0xffffff00 broadcast 192.168.24.255 inet6 fe80::21d:60ff:fead:2ace%em0 prefixlen 64 scopeid 0x1 inet6 2001:41d0:2:2d29:1:1:: prefixlen 80 media: Ethernet 100baseTX (100baseTX <half-duplex>) status: active [root@avoriaz ~]# host www.restart.bel www.restart.bel is an alias for avoriaz.restart.bel. avoriaz.restart.bel has address 192.168.24.1 avoriaz.restart.bel has IPv6 address 2001:41d0:2:2d29:1:1:: pf.conf: int_if="em0" block in log all block out log all set skip on lo0 antispoof quick for $int_if inet # Allow trafic with physical internal network pass in quick on $int_if from ($int_if:network) to ($int_if) keep state pass out quick on $int_if from ($int_if) to ($int_if:network) keep state The problem: [root@avoriaz ~]# telnet -4 www.restart.bel 80 Trying 192.168.24.1... Connected to avoriaz.restart.bel. Escape character is '^]'. ^] telnet> quit Connection closed. [root@avoriaz ~]# telnet -6 www.restart.bel 80 Trying 2001:41d0:2:2d29:1:1::... --->Never connect and get a timeout! tcpdump and logging in pf show me that For a IPv4 connection: the packet from telnet to apache pass 2 times on lo0 (out and in) the answer packet from apache to telnet pass 2 times on lo0 (out and in) So no problem, there is `set skip on lo0' For a IPv6 connection: The first packet from telnet to apache pass 2 times on lo0 (out and in) The answer packet from apache to telnet path on em0 and is rejected due to the default flags S/SA. So I have to change pf.conf and replace the last line: pass out quick on $int_if from ($int_if) to ($int_if:network) \ keep state flags any Then all is OK By the way, on 7.2 netstat -rn display 192.168.24.1 00:1d:60:ad:2a:ce .... 2001:41d0:2:2d29:1:1:: 00:1d:60:ad:2a:ce On 8.0-BETA1 there is an assymetry: netstat -rn display 192.168.24.1 link#3 .... no entry for 2001:41d0:2:2d29:1:1:: Hope it may help someone Henri
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