Hi, I am quite new to IPv6. I ran to one problem hope you guys can help me. I have multiple ethernet port box which runs by Altera's Cyclone 5. I am using source based policy routing for ipv6. The problem is when there is "default via <gateway>" entry in per interface routing table then ping to a link local address of directly connected PC from that interface fails.
# ip -6 rule 0: from all lookup local 16383: from all oif eth2 lookup eth2 16383: from 2001::200 lookup eth2 32766: from all lookup main # ip -6 route show table eth2 2001::/64 dev eth2 src 2001::200 metric 1024 pref medium default via 2001::5 dev eth2 metric 1024 pref medium # ping6 fe80::21b:cdff:fe03:1357 -I eth2 PING fe80::21b:cdff:fe03:1357(fe80::21b:cdff:fe03:1357) from fe80::2b0:aeff:fe03:7c1c eth2: 56 data bytes >From fe80::2b0:aeff:fe03:7c1c icmp_seq=1 Destination unreachable: Address unreachable >From fe80::2b0:aeff:fe03:7c1c icmp_seq=2 Destination unreachable: Address unreachable >From fe80::2b0:aeff:fe03:7c1c icmp_seq=3 Destination unreachable: Address unreachable ^C --- fe80::21b:cdff:fe03:1357 ping statistics --- 5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4007ms # ip -6 route del default dev eth2 table eth2 # ping6 fe80::21b:cdff:fe03:1357 -I eth2 PING fe80::21b:cdff:fe03:1357(fe80::21b:cdff:fe03:1357) from fe80::2b0:aeff:fe03:7c1c eth2: 56 data bytes 64 bytes from fe80::21b:cdff:fe03:1357: icmp_seq=1 ttl=64 time=0.285 ms 64 bytes from fe80::21b:cdff:fe03:1357: icmp_seq=2 ttl=64 time=1.73 ms 64 bytes from fe80::21b:cdff:fe03:1357: icmp_seq=3 ttl=64 time=1.75 ms ^C --- fe80::21b:cdff:fe03:1357 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2001ms rtt min/avg/max/mdev = 0.285/1.258/1.755/0.688 ms >From Wireshark captures, though I ping link local first Neighbor solicitation for default gateway ip 2001::5 goes on wire. Since that gateway is not present ping does not work. If gateway is present and reply with Neighbor Advertisement then echo request and replies with link local happens properly after that. Why does Neighbor Solicitation for default gateway happens though we ping link local address ? I assume link local ping should work despite of unavailable default gateway. Please correct me if am wrong. Also let me know how to change this behavior. I am using 4.1.22-ltsi kernel. Thanks, Sundeep
