Edit: Disregard the part about option 54. Upon further consideration, it likely has nothing at all to due with the issue of responses having a srcIP of the incoming interface, instead of the outgoing interface.
Thanks in advance for any tips! > On Sep 13, 2017, at 1:34 PM, Jason Lixfeld <[email protected]> wrote: > > Hi, > > I have a use case where requests are received on one interface, and responses > are transmitted on another interface. In ISC, this seems to have always > worked as expected, but in Kea, it seems that responses are transmitted with > the srcIP of the receiving interface, instead of the srcIP of the interface > that is expected to transmit the response. > > i.e.: > > 13:06:46.816502 IP (tos 0x0, ttl 253, id 48919, offset 0, flags [none], proto > UDP (17), length 349) > 10.219.45.114.67 > 10.219.66.10.67: [udp sum ok] BOOTP/DHCP, Request from > 00:01:47:2d:7a:d0, length 321, hops 1, xid 0x1e875e1f, Flags [none] (0x0000) > Gateway-IP 10.63.255.1 > Client-Ethernet-Address 00:01:47:2d:7a:d0 > Vendor-rfc1048 Extensions > Magic Cookie 0x63825363 > DHCP-Message Option 53, length 1: Discover > Client-ID Option 61, length 8: "0298056" > Requested-IP Option 50, length 4: 10.63.255.84 > Parameter-Request Option 55, length 14: > Subnet-Mask, Default-Gateway, Domain-Name-Server, Hostname > Domain-Name, BR, Lease-Time, DHCP-Message > Server-ID, TFTP, NTP, Time-Zone > Option 120, Classless-Static-Route > Vendor-Class Option 60, length 20: "ZNID-GE-2628A-00-0GN" > Agent-Information Option 82, length 21: > Circuit-ID SubOption 1, length 6: ^@^D^L7^B^B > Remote-ID SubOption 2, length 11: ^A^Irgw01.lab > END Option 255, length 0 > 13:06:46.824359 IP (tos 0x0, ttl 64, id 43882, offset 0, flags [DF], proto > UDP (17), length 376) > 10.219.66.10.67 > 10.63.255.1.67: [bad udp cksum 0x579b -> 0x037e!] > BOOTP/DHCP, Reply, length 348, hops 1, xid 0x1e875e1f, Flags [none] (0x0000) > Your-IP 10.63.255.84 > Gateway-IP 10.63.255.1 > Client-Ethernet-Address 00:01:47:2d:7a:d0 > Vendor-rfc1048 Extensions > Magic Cookie 0x63825363 > Subnet-Mask Option 1, length 4: 255.255.255.0 > Domain-Name-Server Option 6, length 8: 66.207.192.4,206.223.173.6 > Lease-Time Option 51, length 4: 60 > DHCP-Message Option 53, length 1: Offer > Server-ID Option 54, length 4: 10.219.66.10 > RN Option 58, length 4: 900 > RB Option 59, length 4: 1800 > Client-ID Option 61, length 8: "0298056" > TFTP Option 66, length 11: "10.63.255.1" > Classless-Static-Route Option 121, length 16: > (10.32.0.0/24:10.63.255.1),(10.32.11.0/24:10.63.255.1) > Agent-Information Option 82, length 21: > Circuit-ID SubOption 1, length 6: ^@^D^L7^B^B > Remote-ID SubOption 2, length 11: ^A^Irgw01.lab > END Option 255, length 0 > > root@kea1:/usr/local/etc/kea# ip route > default via 10.219.66.1 dev ens32 onlink > 10.32.0.0/11 dev ens34 scope link > 10.32.0.32/28 dev ens34 proto kernel scope link src 10.32.0.40 > 10.219.66.0/24 dev ens32 proto kernel scope link src 10.219.66.10 > root@kea1:/usr/local/etc/kea# > > OFFER is being sent to 10.63.255.1, but sourced from 10.219.66.10, when it > should be sourced from 10.32.0.40. > > I can’t seem to adjust option 54 to force the server ID (which may be the > whole issue to begin with?): > > 2017-09-13 13:31:33.238 DEBUG [kea-dhcp4.bad-packets/522] > DHCP4_PACKET_DROP_0007 [hwtype=1 00:01:47:2d:7a:d0], > cid=[00:30:32:39:38:30:35:36], tid=0x52055156: failed to process packet: > Option 54 already present in this message. > > { > "client-class" : "rgw01.lab", > "subnet": "10.63.255.0/24", > "valid-lifetime": 60, > "option-data": [ > { > "name": "domain-name-servers", > "code": 6, > "space": "dhcp4", > "csv-format": true, > "data": "66.207.192.4, 206.223.173.6" > }, > { > "name": "tftp-server-name", > "data": "10.63.255.1" > }, > { > "name" : "dhcp-server-identifier", > "code" : 54, > "space" : "dhcp4", > "csv-format" : true, > "data" : "10.63.255.1" > }, > { > "name": "classless-static-routes", > "data": "180A20000A3FFF01180A200B0A3FFF01" > } > ], > "pools": [ > { > "pool": "10.63.255.2 - 10.63.255.254" > } > ], > "reservations": [ > { > "flex-id": "010972677730312e6c616200040c370201", > "ip-address": "10.63.255.69", > "boot-file-name": "byor/26xx_current/S0300608" > } > ] > } > > > Any pointers? > > Thanks! > > > _______________________________________________ > Kea-users mailing list > [email protected] > https://lists.isc.org/mailman/listinfo/kea-users _______________________________________________ Kea-users mailing list [email protected] https://lists.isc.org/mailman/listinfo/kea-users
