Is vpp running as root? See https://fd.io/docs/vpp/master/usecases/homegateway.html, a known-good integrated routing-and-bridging setup.
The Linux netstack uses the address specified by the “host-ip4-gw” stanza as its default route. HTH... Dave From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of vyshakh krishnan Sent: Tuesday, November 26, 2019 8:49 AM To: Dave Barach (dbarach) <dbar...@cisco.com> Cc: vpp-dev@lists.fd.io Subject: Re: [vpp-dev] tuntap interface in VPP Thanks Dave. I have tried this but getting the following error. Any idea how to fix this? vpp# create tap host-if-name abc create tap: open '/dev/vhost-net': Operation not permitted ubuntu@vpp4:~$ ls -ltr /dev/vhost-net crwxrwxrwx 1 root root 10, 238 Nov 26 04:33 /dev/vhost-net Also one more thing, in your set up of home gateway, how the host OS is redirecting the packet to VPP back? how are you importing the VPP routes to host OS? Thanks Vyshakh On Tue, Nov 26, 2019 at 3:56 AM Dave Barach (dbarach) <dbar...@cisco.com<mailto:dbar...@cisco.com>> wrote: Try something like this: create tap host-if-name lstack host-ip4-addr 192.168.2.2/24<http://192.168.2.2/24> host-ip4-gw 192.168.2.1 set int ip address tap0 <vpp address on the 192.168.2.X/24 subnet> # vpp interface in L3 mode or set int l2 bridge tap0 1 # vpp interface in L2 mode. I use the latter setup in production on my vpp home gateway. HTH... Dave From: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> On Behalf Of vyshakh krishnan Sent: Monday, November 25, 2019 1:29 PM To: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> Subject: [vpp-dev] tuntap interface in VPP Hi, Our requirement was to redirect the telnet packets to host OS from VPP so that the kernel stack can reply to the telnet packet. And found that tuntap interface in VPP is perfect for this. I was able create tuntap interface using: vpp# tap connect newtap tapcli-0 vpp# show in inacl interface vpp# show interface Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count local0 0 down 0/0/0/0 memif0/0 1 up 9000/0/0/0 rx packets 161 rx bytes 9096 tx packets 499 tx bytes 31437 drops 945 tx-error 785 tapcli-0 2 down 9000/0/0/0 drops 8 which created the following in host: newtap: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::cc6c:feff:feed:ff11 prefixlen 64 scopeid 0x20<link> ether ce:6c:fe:ed:ff:11 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 7 bytes 586 (586.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Can anyone please help me with the following questions: 1. How will we assign an IP to this host interface (newtap). Is there a way to do this from VPP (set int ip addr tapcli-0 192.168.3.1/24<http://192.168.3.1/24> --> assigns IP only to VPP interface.) 2. How will host OS reply to the packets? Routing entries are known only to VPP. is there a way to export these to host OS networking stack from VPP? Thanks Vyshakh -- --Regards Vyshakh Krishnan C H
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