https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245181
--- Comment #4 from Scott Aitken <freebsd-bugzi...@thismonkey.com> ---
I think the code at line 1051 is actually the culprit:
/* XXX MRT use table 0 for arp reply */
if (fib4_lookup_nh_basic(0, itaddr, 0, 0, &nh4) != 0)
goto drop;
I believe this is where the target of the ARP request is looked up (line 1073
also validates the source - which would also require fixing as it only checks
FIB 0).
TESTING SETUP:
Host_1: IP 10.1.1.60, constantly pinging 10.1.4.99 via router (.1)
Host_2: IP 10.1.4.20/24 on vmx0, 10.1.4.99/32 on lo1, default via 10.1.4.1
Host_2:
# sysctl net.add_addr_allfibs net.inet.ip.forwarding
net.link.ether.inet.proxyall net.fibs
net.add_addr_allfibs: 0
net.inet.ip.forwarding: 1
net.link.ether.inet.proxyall: 1
net.fibs: 2
TESTS (run on Host_2):
--- Test FIB 0 and proxy ARP:
# ifconfig vmx0
vmx0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=e403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
ether 00:50:56:8a:93:4e
inet 10.1.4.20 netmask 0xffffff00 broadcast 10.1.4.255
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
# netstat -rn4
Routing tables
Internet:
Destination Gateway Flags Netif Expire
default 10.1.4.1 UGS vmx0
10.1.4.0/24 link#1 U vmx0
10.1.4.20 link#1 UHS lo0
127.0.0.1 link#2 UH lo0
# ifconfig lo1 create inet 10.1.4.99/32
(ping 10.1.4.99 succeeds as expected)
--- Test FIB 0 and NO proxy ARP:
# sysctl net.link.ether.inet.proxyall=0
net.link.ether.inet.proxyall: 1 -> 0
(ARP entry on router for 10.1.4.99 deleted)
(ping 10.1.4.99 fails as expected)
--- Test FIB 0 and proxy ARP restored:
# sysctl net.link.ether.inet.proxyall=1
net.link.ether.inet.proxyall: 0 -> 1
(ping 10.1.4.99 succeeds as expected)
All test results as expected.
--- Test FIB 1 and proxy ARP:
# ifconfig vmx0 inet delete
# ifconfig vmx0 inet 10.1.4.20/24 fib 1
# ifconfig lo1 destroy
# ifconfig lo1 create inet 10.1.4.99/32 fib 1
# setfib 1 route add default 10.1.4.1
add net default: gateway 10.1.4.1 fib 1
# netstat -rn4
Routing tables
Internet:
Destination Gateway Flags Netif Expire
127.0.0.1 link#2 UH lo0
# setfib 1 netstat -rn4
Routing tables (fib: 1)
Internet:
Destination Gateway Flags Netif Expire
default 10.1.4.1 UGS vmx0
10.1.4.0/24 link#1 U vmx0
10.1.4.20 link#1 UHS lo0
10.1.4.99 link#4 UH lo1
127.0.0.1 lo0 UHS lo0
(ARP entry on router for 10.1.4.99 deleted)
(ping 10.1.4.99 fails NOT as expected)
# tcpdump -i vmx0 arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on vmx0, link-type EN10MB (Ethernet), capture size 262144 bytes
12:04:28.438590 ARP, Request who-has 10.1.4.99 tell 10.1.4.1, length 46
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