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."
> 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 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/
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