From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 References: <20180825182739.667A1156E400@mail.bitblocks.com> In-Reply-To: <20180825182739.667A1156E400@mail.bitblocks.com> From: Alexander Kapshuk Date: Sat, 25 Aug 2018 22:17:16 +0300 Message-ID: To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: text/plain; charset="UTF-8" Subject: Re: [9fans] Static ip configuration for a standalone cpu server in qemu on Linux Topicbox-Message-UUID: dddca996-ead9-11e9-9d60-3106f5b1d025 Thanks Hiro and Bakul for your prompt responses. Here's what I've got to report... I brought tap0 as user root: ip link set dev tap0 up ip addr show dev tap0 4: tap0: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether c6:1c:63:d9:91:1d brd ff:ff:ff:ff:ff:ff inet 10.0.0.1/24 scope global tap0 valid_lft forever preferred_lft forever inet6 fe80::c41c:63ff:fed9:911d/64 scope link valid_lft forever preferred_lft forever ping -c4 10.0.0.2 PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data. >>From 10.0.0.1 icmp_seq=1 Destination Host Unreachable >>From 10.0.0.1 icmp_seq=2 Destination Host Unreachable >>From 10.0.0.1 icmp_seq=3 Destination Host Unreachable >>From 10.0.0.1 icmp_seq=4 Destination Host Unreachable --- 10.0.0.2 ping statistics --- 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 75ms pipe 4 # In qemu I got this output: arpreq: 10.0.0.1 also has ether address c61c63d9911d # Tcpdump output on Linux host: tcpdump -nS -vv -i tap0 tcpdump: listening on tap0, link-type EN10MB (Ethernet), capture size 262144 bytes 22:12:40.302180 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::c41c:63ff:fed9:911d > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16 source link-address option (1), length 8 (1): c6:1c:63:d9:91:1d 0x0000: c61c 63d9 911d 22:12:47.874535 IP (tos 0x0, ttl 1, id 18152, offset 0, flags [DF], proto UDP (17), length 195) 10.0.0.1.49968 > 239.255.255.250.1900: [udp sum ok] UDP, length 167 22:12:48.875587 IP (tos 0x0, ttl 1, id 18675, offset 0, flags [DF], proto UDP (17), length 195) 10.0.0.1.49968 > 239.255.255.250.1900: [udp sum ok] UDP, length 167 22:12:49.875963 IP (tos 0x0, ttl 1, id 19386, offset 0, flags [DF], proto UDP (17), length 195) 10.0.0.1.49968 > 239.255.255.250.1900: [udp sum ok] UDP, length 167 22:12:50.876052 IP (tos 0x0, ttl 1, id 20194, offset 0, flags [DF], proto UDP (17), length 195) 10.0.0.1.49968 > 239.255.255.250.1900: [udp sum ok] UDP, length 167 22:13:25.356189 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.2 tell 10.0.0.1, length 28 22:13:26.382153 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.2 tell 10.0.0.1, length 28 22:13:27.406149 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.2 tell 10.0.0.1, length 28 22:13:28.430247 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.2 tell 10.0.0.1, length 28 22:13:29.454154 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.2 tell 10.0.0.1, length 28 22:13:30.478150 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.2 tell 10.0.0.1, length 28 Thanks. On Sat, Aug 25, 2018 at 9:29 PM Bakul Shah wrote: > > On Sat, 25 Aug 2018 14:20:44 +0300 Alexander Kapshuk wrote: > > I am trying to follow the instructions given here: > > > > http://fqa.9front.org/fqa3.html#3.3.1.4.4 > > 3.3.1.4.4 - Linux TAP > > > > Here's what I've done so far: > > (1). Set up a tap0 device as user root: > > ip tuntap add dev tap0 mode tap user sasha > > ip address add 10.0.0.1/24 dev tap0 > > > > ip addr show dev tap0 > > 4: tap0: mtu 1500 qdisc noop state DOWN group > > default qlen 1000 > > link/ether c6:1c:63:d9:91:1d brd ff:ff:ff:ff:ff:ff > > inet 10.0.0.1/24 scope global tap0 > > valid_lft forever preferred_lft forever > > I see that tap0 state is DOWN. Try bringing it up. > If that still doesn't work, run > tcpdump -ni tap0 > and tell us what you discover. >