GRE in a fib via rc.conf
- Reply: Zhenlei Huang : "Re: GRE in a fib via rc.conf"
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Date: Tue, 08 Nov 2022 00:26:32 UTC
All I am looking for some help on if my setup makes sense. I have a vm with two interfaces. One for access to the host , we'll call this mgmt . One for routing traffic, we'll call this routing . I want to put the routing interface into a fib and to run a gre tunnel over it. Sounds simple enough. The problem I am seeing is that it looks like the tunneled traffic is leaked into the default fib and I don't see why. I am not sure if this is config nit or if this is an issue. Should the gre10 interface be in fib 1 ? See below. ### RC CONF ### ifconfig_vmx0="inet 10.23.121.253/24 description mgmt" ifconfig_vmx1="inet 100.65.101.14/28 mtu 9000 description routing fib 1" defaultrouter="10.23.121.1" static_routes="ewr10gresrc" route_ewr10gresrc=" 192.168.255.14 100.65.101.1 -fib 1" cloned_interfaces="gre10" ifconfig_gre10=" inet 100.67.103.2 100.67.103.1 netmask 255.255.255.252 tunnel 100.65.101.14 192.168.255.14 tunnelfib 1" ############### ### DEFAULT FIB ### ~ # netstat -nr4Wl Routing tables Internet: Destination Gateway Flags Nhop# Mtu Netif Expire default 10.23.121.1 UGS 6 1500 vmx0 10.23.121.0/24 link#1 U 2 1500 vmx0 10.23.121.253 link#1 UHS 3 16384 lo0 100.67.103.1 link#4 UH 4 1476 gre10 100.67.103.2 link#4 UHS 5 16384 lo0 127.0.0.1 link#3 UH 1 16384 lo0 ### FIB 1 ### # setfib 1 netstat -nr4Wl Routing tables (fib: 1) Internet: Destination Gateway Flags Nhop# Mtu Netif Expire 100.65.101.0/28 link#2 U 1 9000 vmx1 100.65.101.14 link#2 UHS 2 16384 lo0 127.0.0.1 link#3 UHS 3 16384 lo0 192.168.255.14 100.65.101.1 UGHS 4 9000 vmx1 ##### PING EXAMPLES ##### # setfib 1 ping -c 1 -t 2 100.67.103.1 PING 100.67.103.1 (100.67.103.1): 56 data bytes ping: sendto: No route to host --- 100.67.103.1 ping statistics --- 1 packets transmitted, 0 packets received, 100.0% packet loss # setfib 0 ping -c 1 -t 2 100.67.103.1 PING 100.67.103.1 (100.67.103.1): 56 data bytes 64 bytes from 100.67.103.1: icmp_seq=0 ttl=255 time=1.528 ms --- 100.67.103.1 ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 1.528/1.528/1.528/0.000 ms #### TCPDUMP #### ICMP packets are in fact sourced from the gre10 interface. The GRE packets are also only going out the routing interface. See the following pastebin for details. https://pastebin.com/n3mGXGHA -- mark saad | nonesuch@longcount.org