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Subject: Re: [Intel-wired-lan] Fw: [Bug 221750] New: igc: Intel I225 silently drops UDP broadcast to port 68 (DHCP) when interface is a bridge member X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 22/07/2026 18:46, Stephen Hemminger wrote: > Linux networking does not really use bugzilla, instead use email. > > $ ./scripts/get_maintainer.pl drivers/net/ethernet/intel/igc > Tony Nguyen (maintainer:INTEL ETHERNET DRIVERS) > Przemek Kitszel (maintainer:INTEL ETHERNET DRIVERS) > Andrew Lunn (maintainer:NETWORKING DRIVERS) > "David S. Miller" (maintainer:NETWORKING DRIVERS) > Eric Dumazet (maintainer:NETWORKING DRIVERS) > Jakub Kicinski (maintainer:NETWORKING DRIVERS) > Paolo Abeni (maintainer:NETWORKING DRIVERS) > intel-wired-lan@lists.osuosl.org (moderated list:INTEL ETHERNET DRIVERS) > netdev@vger.kernel.org (open list:NETWORKING DRIVERS) > > > Begin forwarded message: > > Date: Mon, 13 Jul 2026 16:20:22 +0000 > From: bugzilla-daemon@kernel.org > To: stephen@networkplumber.org > Subject: [Bug 221750] New: igc: Intel I225 silently drops UDP broadcast to port 68 (DHCP) when interface is a bridge member > > > https://bugzilla.kernel.org/show_bug.cgi?id=221750 > > Bug ID: 221750 > Summary: igc: Intel I225 silently drops UDP broadcast to port > 68 (DHCP) when interface is a bridge member > Product: Networking > Version: 2.5 > Hardware: Intel > OS: Linux > Status: NEW > Severity: normal > Priority: P3 > Component: Other > Assignee: stephen@networkplumber.org > Reporter: eslopez92@gmail.com > Regression: No > > ## Description > > When an Intel I225-LM NIC using the igc driver is added as a member of a Linux > bridge, UDP broadcast packets with destination port 68 (DHCP client port) are > silently dropped at the TX path. The kernel queues the packet for transmission > (visible via AF_PACKET capture on the interface showing PACKET_OUTGOING), but > the frame never appears on the physical wire. > > All other UDP broadcast ports (e.g., port 9998) transmit correctly through the > same bridge, same interface, same code path. Only destination port 67/68 (DHCP) > is affected. > > This breaks any DHCP server (e.g., dnsmasq) running on the bridge host, as DHCP > offers never reach clients. > > ### Keywords > > igc, I225, bridge, DHCP, broadcast, TX drop, dnsmasq > > ### Kernel version > > Linux version 6.8.0-134-generic (Ubuntu 24.04) > Also tested: 6.17.0-35-generic (Ubuntu 24.04 HWE) - same behavior > > ### How to reproduce > > 1. System: Supermicro X13SAZ-F with Intel I225-LM (PCI 8086:15f2), igc driver > 2. Create a Linux bridge and enslave the igc interface: > > ip link add br-fvn type bridge > ip link set eno1 master br-fvn > ip addr add 172.31.0.3/16 dev br-fvn > ip link set br-fvn up > > 3. Run dnsmasq as DHCP server on br-fvn: > > dnsmasq --interface=br-fvn > --dhcp-range=172.31.100.1,172.31.254.255,255.255.0.0,12h --dhcp-authoritative > > 4. Connect a DHCP client to eno1 (directly or via switch) > 5. Observe: dnsmasq logs show DHCPDISCOVER received and DHCPOFFER sent, but the > client never receives the offer > > ### Verification that the bug is interface-specific > > - Replacing eno1 (igc, I225-LM) with a USB ethernet adapter (r8152, RTL8153) in > the same bridge: DHCP works immediately > - Using an Intel I210 NIC (igb driver) in the same bridge on identical kernel: > DHCP works > - Sending UDP broadcast to port 9998 from the same bridge via the same igc > interface: packets arrive at client > - Sending UDP broadcast to port 68 from the same bridge via the same igc > interface: packets never arrive > - AF_PACKET raw capture on eno1 (host side) shows the DHCP offer as > PACKET_OUTGOING (type=4), confirming the kernel hands it to the driver, but the > frame never hits the wire > - Wireshark/tcpdump on the client confirms zero DHCP offers received > > ### Environment > > Processor: Intel Core i9-14900K > Board: Supermicro X13SAZ-F > NIC: Intel I225-LM (8086:15f2, subsystem 15d9:15f2) > Driver: igc > Firmware: 1073:8754 > Bus: 0000:01:00.0 (PCIe x1, 5.0 GT/s) > OS: Ubuntu Core 24 (snap-based) > > ### Other notes > > - ethtool -K br-fvn tx-checksum-ip-generic off was tested - no change > - bridge-nf-call-iptables=0 was tested - no change > - br_netfilter module unloaded - no change > - net.ipv4.ip_forward=1 was tested - no change > - No iptables, nftables, or ebtables rules present > - No eBPF/XDP programs attached > - The igb driver (Intel I210) does NOT exhibit this behavior on the same kernel > Thank you for the detailed analysis and information. I've done some digging and it looks like an issue that has been fixed in firmware. Your environment shows I225-LM Firmware: 1073:8754 which indicates version 1.73. I believe the fix to be available starting from version 1.91. It may require an update to the AMT FW as well. Both should be distributed by the motherboard vendor. I suggest to inquire with Supermicro whether they have a FW update for your device. It may be included in the full BIOS/BMC/Bundle that they offer. --Dima