Re: proxy_arp's DHCP snooper does not recognize the following DHCP response

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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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