Hoi,
aha- the response is going to an IPv4 address that the server has
assigned to you (192.168.25.1.67 > 192.168.25.36.68) and because that
address is not configured in VPP, it will not relay it to the TAP.
For isc-dhclient, I think you can use -B
(https://linux.die.net/man/8/dhclient) to ask it to tell the
dhcp-server to /broadcast/ it's reply. Does that help (can you show a
tcpdump of that transaction) ?
groet,
Pim
On Thu, Mar 2, 2023 at 12:05 AM Bauruine <li...@tuxli.ch> wrote:
Grüezi Pim
Thank you for the reply.
I rewired it to a DHCP server under my control and did a tcpdump
on it while running dhclient -v ge0-3.
23:56:25.067464 00:0d:b9:50:99:0a > ff:ff:ff:ff:ff:ff, ethertype
IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0,
flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP,
Request from 00:0d:b9:50:99:0a, length 300, xid 0xbba5cf6a, secs
48, Flags [none] (0x0000)
Client-Ethernet-Address 00:0d:b9:50:99:0a
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: Discover
Hostname (12), length 10: "gw02"
Parameter-Request (55), length 13:
Subnet-Mask (1), BR (28), Time-Zone (2),
Default-Gateway (3)
Domain-Name (15), Domain-Name-Server (6), Unknown
(119), Hostname (12)
Netbios-Name-Server (44), Netbios-Scope (47), MTU (26),
Classless-Static-Route (121)
NTP (42)
23:56:25.072057 00:0d:b9:50:9a:ad > 00:0d:b9:50:99:0a, ethertype
IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0,
flags [none], proto UDP (17), length 328)
192.168.25.1.67 > 192.168.25.36.68: [udp sum ok] BOOTP/DHCP,
Reply, length 300, xid 0xbba5cf6a, secs 48, Flags [none] (0x0000)
Your-IP 192.168.25.36
Server-IP 192.168.25.1
Client-Ethernet-Address 00:0d:b9:50:99:0a
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: Offer
Server-ID (54), length 4: 192.168.25.1
Lease-Time (51), length 4: 43200
Subnet-Mask (1), length 4: 255.255.255.0
Default-Gateway (3), length 4: 192.168.25.1
Domain-Name (15), length 15: "local.tuxli.ch
<http://local.tuxli.ch>."
Domain-Name-Server (6), length 4: 192.168.1.1
I'm not sure how to do a "tcpdump" in VPP. On the TAP interface I
can't see a response.
On 01.03.23 23:20, Pim van Pelt via lists.fd.io
<http://lists.fd.io> wrote:
Hoi Baurine,
Do you happen to have the ability to tcpdump on the DHCP server?
I am confident that linux-cp (and the lcpng) will forward this
traffic out because it's a broadcast packet (and all traffic
will be handled), but I am not confident that the packet is (a)
arriving at the DHCP server and (b) being returned or (c) being
forwarded through the TAP to your dhclient.
Can you possibly tcpdump on the /DHCP/ /server ?/
groet,
Pim
On Wed, Mar 1, 2023 at 8:36 PM Bauruine <li...@tuxli.ch> wrote:
Hi Xiaodong
Yes and if i add an ip to the tap in Linux it also shows up
in VPP. I'm adding the full config at the end of the mail.
No I can't get an answer that's what I'm trying to achieve.
[stefan@gw02:~]$ sudo dhclient -v ge0-3
Listening on LPF/ge0-3/00:0d:b9:50:99:0a
Sending on LPF/ge0-3/00:0d:b9:50:99:0a
Sending on Socket/fallback
DHCPDISCOVER on ge0-3 to 255.255.255.255 port 67 interval 3
(xid=0x5538f068)
DHCPDISCOVER on ge0-3 to 255.255.255.255 port 67 interval 3
(xid=0x5538f068)
DHCPDISCOVER on ge0-3 to 255.255.255.255 port 67 interval 7
(xid=0x5538f068)
[stefan@gw02:~]$ grep -v "\#" /etc/vpp/startup.conf | grep
-v -e '^$'
unix {
nodaemon
log /var/log/vpp/vpp.log
full-coredump
cli-listen /run/vpp/cli.sock
gid vpp
exec /etc/vpp/bootstrap.vpp
}
api-trace {
on
}
api-segment {
gid vpp
}
socksvr {
default
}
cpu {
main-core 1
workers 2
skip-cores 0
}
plugins {
plugin lcpng_nl_plugin.so { enable }
plugin lcpng_if_plugin.so { enable }
}
logging {
default-syslog-log-level info
class linux-cp/if { rate-limit 10000 level debug
syslog-level debug }
class linux-cp/nl { rate-limit 10000 level debug
syslog-level debug }
}
lcpng {
lcp-sync
lcp-auto-subint
}
[stefan@gw02:~]$ grep -v -e '^$' /etc/vpp/bootstrap.vpp
set interface state GigabitEthernet3/0/0 up
lcp create GigabitEthernet3/0/0 host-if ge0-3
On 01.03.23 20:08, Xiaodong Xu wrote:
Hi Stefan,
Did you also enable 'linux-nl' plugin, in addition to
'linux-cp'? I suppose 'linux-nl' is the one which syncs IP
addresses/routes from Linux to VPP.
BTW, were you able to get the IP address / route after you
ran the dhcp client on the tap interface? If not what do
the error / log messages look like?
Xiaodong
On Wed, Mar 1, 2023 at 10:42 AM Bauruine <li...@tuxli.ch>
wrote:
Hi
I would like to use VPP with the lcpng plugin as a home
gateway where I
have to use dhcp to get an IP from my ISP. If I use the
dhcp plugin of
VPP it works and I can see an IP address on the
interface on Linux but
no route which was to be expected as lcpng doesn't sync
routes from VPP
to Linux.
Is it possible to use a dhcp client on Linux to get the
IP and routes on
Linux where they are synced back to VPP? I naively
tried "lcp create
GigabitEthernet3/0/0 host-if ge0-3" in VPP and then
"dhclient -v ge0-3"
on Linux without success. Is there anything I have to
configure or is
this not possible? I'm using VPP 23.02 with lcpng master.
Any help is highly appreciated.
Best regards,
Stefan
--
Pim van Pelt <p...@ipng.nl>
PBVP1-RIPE - http://www.ipng.nl/
--
Pim van Pelt <p...@ipng.nl>
PBVP1-RIPE - http://www.ipng.nl/
