proxy_arp's DHCP snooper does not recognize the following DHCP response
rany
rany2 at riseup.net
Tue Apr 18 04:34:22 PDT 2023
I'm not sure if this is helpful but I believe this is the only device
which does not have a DHCP hostname set. Whether that is related or just
a coincidence, I do not know.
On 4/18/23 14:29, rany wrote:
> Hello,
>
> My Pixel 6 phone running GrapheneOS does not get recognized by the
> DHCP snooper that is used by proxy_arp is enabled.
>
> If any additional information is needed, I'm more than willing to
> provide it. (Also: apologies if this isn't the right place to report
> this, in the case that I'm in the wrong place please let me know where
> to take this report)
>
> Below is the tcpdump of the DHCP messages in question:
>
> 14:27:08.429655 6a:85:25:53:52:87 > ff:ff:ff:ff:ff:ff, ethertype IPv4
> (0x0800), length 330: (tos 0x10, ttl 64, id 0, offset 0, flags [DF],
> proto UDP (17), length 316)
> 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
> 6a:85:25:53:52:87, length 288, xid 0x7cc4d1b2, Flags [none]
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: Discover
> Client-ID (61), length 7: ether 6a:85:25:53:52:87
> MSZ (57), length 2: 1500
> Vendor-Class (60), length 15: "android-dhcp-13"
> Parameter-Request (55), length 12:
> Subnet-Mask (1), Default-Gateway (3), Domain-Name-Server
> (6), Domain-Name (15)
> MTU (26), BR (28), Lease-Time (51), RN (58)
> RB (59), Vendor-Option (43), URL (114), Unknown (108)
> 14:27:09.439824 6a:85:25:53:52:87 > ff:ff:ff:ff:ff:ff, ethertype IPv4
> (0x0800), length 330: (tos 0x10, ttl 64, id 0, offset 0, flags [DF],
> proto UDP (17), length 316)
> 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
> 6a:85:25:53:52:87, length 288, xid 0x7cc4d1b2, secs 1, Flags [none]
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: Discover
> Client-ID (61), length 7: ether 6a:85:25:53:52:87
> MSZ (57), length 2: 1500
> Vendor-Class (60), length 15: "android-dhcp-13"
> Parameter-Request (55), length 12:
> Subnet-Mask (1), Default-Gateway (3), Domain-Name-Server
> (6), Domain-Name (15)
> MTU (26), BR (28), Lease-Time (51), RN (58)
> RB (59), Vendor-Option (43), URL (114), Unknown (108)
> 14:27:11.461546 6a:85:25:53:52:87 > ff:ff:ff:ff:ff:ff, ethertype IPv4
> (0x0800), length 330: (tos 0x10, ttl 64, id 0, offset 0, flags [DF],
> proto UDP (17), length 316)
> 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
> 6a:85:25:53:52:87, length 288, xid 0x7cc4d1b2, secs 3, Flags [none]
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: Discover
> Client-ID (61), length 7: ether 6a:85:25:53:52:87
> MSZ (57), length 2: 1500
> Vendor-Class (60), length 15: "android-dhcp-13"
> Parameter-Request (55), length 12:
> Subnet-Mask (1), Default-Gateway (3), Domain-Name-Server
> (6), Domain-Name (15)
> MTU (26), BR (28), Lease-Time (51), RN (58)
> RB (59), Vendor-Option (43), URL (114), Unknown (108)
> 14:27:12.004533 00:20:91:aa:78:3b > 6a:85:25:53:52:87, ethertype IPv4
> (0x0800), length 351: (tos 0xc0, ttl 64, id 27411, offset 0, flags
> [none], proto UDP (17), length 337)
> 10.146.80.1.67 > 10.146.83.135.68: BOOTP/DHCP, Reply, length 309,
> xid 0x7cc4d1b2, Flags [none]
> Your-IP 10.146.83.135
> Server-IP 10.146.80.1
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: Offer
> Server-ID (54), length 4: 10.146.80.1
> Lease-Time (51), length 4: 3600
> RN (58), length 4: 1800
> RB (59), length 4: 3150
> Subnet-Mask (1), length 4: 255.255.240.0
> BR (28), length 4: 10.146.95.255
> Default-Gateway (3), length 4: 10.146.80.1
> Domain-Name-Server (6), length 4: 10.146.80.1
> Domain-Name (15), length 11: "rlan.eu.org"
> MTU (26), length 2: 1500
> 14:27:12.005570 00:20:91:aa:78:3b > 6a:85:25:53:52:87, ethertype IPv4
> (0x0800), length 351: (tos 0xc0, ttl 64, id 27412, offset 0, flags
> [none], proto UDP (17), length 337)
> 10.146.80.1.67 > 10.146.83.135.68: BOOTP/DHCP, Reply, length 309,
> xid 0x7cc4d1b2, secs 1, Flags [none]
> Your-IP 10.146.83.135
> Server-IP 10.146.80.1
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: Offer
> Server-ID (54), length 4: 10.146.80.1
> Lease-Time (51), length 4: 3600
> RN (58), length 4: 1800
> RB (59), length 4: 3150
> Subnet-Mask (1), length 4: 255.255.240.0
> BR (28), length 4: 10.146.95.255
> Default-Gateway (3), length 4: 10.146.80.1
> Domain-Name-Server (6), length 4: 10.146.80.1
> Domain-Name (15), length 11: "rlan.eu.org"
> MTU (26), length 2: 1500
> 14:27:12.006471 00:20:91:aa:78:3b > 6a:85:25:53:52:87, ethertype IPv4
> (0x0800), length 351: (tos 0xc0, ttl 64, id 27413, offset 0, flags
> [none], proto UDP (17), length 337)
> 10.146.80.1.67 > 10.146.83.135.68: BOOTP/DHCP, Reply, length 309,
> xid 0x7cc4d1b2, secs 3, Flags [none]
> Your-IP 10.146.83.135
> Server-IP 10.146.80.1
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: Offer
> Server-ID (54), length 4: 10.146.80.1
> Lease-Time (51), length 4: 3600
> RN (58), length 4: 1800
> RB (59), length 4: 3150
> Subnet-Mask (1), length 4: 255.255.240.0
> BR (28), length 4: 10.146.95.255
> Default-Gateway (3), length 4: 10.146.80.1
> Domain-Name-Server (6), length 4: 10.146.80.1
> Domain-Name (15), length 11: "rlan.eu.org"
> MTU (26), length 2: 1500
> 14:27:12.121619 6a:85:25:53:52:87 > ff:ff:ff:ff:ff:ff, ethertype IPv4
> (0x0800), length 342: (tos 0x10, ttl 64, id 0, offset 0, flags [DF],
> proto UDP (17), length 328)
> 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
> 6a:85:25:53:52:87, length 300, xid 0x7cc4d1b2, secs 3, Flags [none]
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: Request
> Client-ID (61), length 7: ether 6a:85:25:53:52:87
> Requested-IP (50), length 4: 10.146.83.135
> Server-ID (54), length 4: 10.146.80.1
> MSZ (57), length 2: 1500
> Vendor-Class (60), length 15: "android-dhcp-13"
> Parameter-Request (55), length 12:
> Subnet-Mask (1), Default-Gateway (3), Domain-Name-Server
> (6), Domain-Name (15)
> MTU (26), BR (28), Lease-Time (51), RN (58)
> RB (59), Vendor-Option (43), URL (114), Unknown (108)
> 14:27:12.158395 00:20:91:aa:78:3b > 6a:85:25:53:52:87, ethertype IPv4
> (0x0800), length 351: (tos 0xc0, ttl 64, id 27414, offset 0, flags
> [none], proto UDP (17), length 337)
> 10.146.80.1.67 > 10.146.83.135.68: BOOTP/DHCP, Reply, length 309,
> xid 0x7cc4d1b2, secs 3, Flags [none]
> Your-IP 10.146.83.135
> Server-IP 10.146.80.1
> Client-Ethernet-Address 6a:85:25:53:52:87
> Vendor-rfc1048 Extensions
> Magic Cookie 0x63825363
> DHCP-Message (53), length 1: ACK
> Server-ID (54), length 4: 10.146.80.1
> Lease-Time (51), length 4: 3600
> RN (58), length 4: 1800
> RB (59), length 4: 3150
> Subnet-Mask (1), length 4: 255.255.240.0
> BR (28), length 4: 10.146.95.255
> Default-Gateway (3), length 4: 10.146.80.1
> Domain-Name-Server (6), length 4: 10.146.80.1
> Domain-Name (15), length 11: "rlan.eu.org"
> MTU (26), length 2: 1500
>
> Thank you,
> rany
>
>
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