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Question about default route setup #240
Description
Hi there,
I'm researching the capabilities of the OpenFastPath stack.
I hit a problem where my packets get dropped and found that my rule for default route doesn't work.
The packets get dropped because ofp_get_next_hop can't find next hop when processing output packets.
I'm able to reproduce and show my problem with the following simplified snippet:
struct ofp_route_msg rtpars = {
.type = OFP_ROUTE_ADD,
.flags = OFP_RTF_GATEWAY,
.dst = 0x00000000,
.masklen = 0,
.gw = 0x011E140A, // 10.20.30.1
.port = 0,
.vlan = 0,
.vrf = 0,
.dst6 = {},
.gw6 = {}};
ofp_set_route_msg(&rtpars);
usleep(1'000'000);
ofp_show_routes(STDOUT_FILENO, OFP_SHOW_ROUTES);
uint32_t flags = 0;
uint32_t addr = 0x051E140A; // 10.20.30.5
printf("Next hop %p for %s\n",
ofp_get_next_hop(rtpars.vrf, addr, &flags),
ofp_print_ip_addr(addr));
This code prints:
Destination Gateway Iface Flags
VRF: 0
0.0.0.0/0 10.20.30.1 fp0 net gateway
Next hop (nil) for 10.20.30.5 <----- Next hop is not found for this ip address
And just to make sure that the above snippet actually works. If I do this change in the above code
.dst = 0x001E140A, // 10.20.30.0
.masklen = 24,
then the code prints:
Destination Gateway Iface Flags
VRF: 0
10.20.30.0/24 10.20.30.1 fp0 net gateway
Next hop 0x7f5e106e936c for 10.20.30.5 <----- Next hop is found
So, my question is: What I'm doing wrong and how can I setup default route for all packets?
Thanks,
Pavel.
Activity
MatiasElo commentedon Feb 3, 2020
You may get some useful info if you configure OFP with
--enable-debugflag.